Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Series A Redeemable Preferred Stock [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Stock Notes Receivable From Employees [Member]
Retained Earnings (Accumulated Deficit) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2015 $ 188,990 $ 0 $ 4 $ 80,591 $ (4) $ 107,942 $ 457
Beginning Balance, Shares at Dec. 31, 2015   0 37,396,456        
Net and comprehensive income 65,010 $ 0 $ 0 0 0 64,657 353
Stock-based compensation 7,035 $ 0 $ 0 7,035 0 0 0
Stock-based compensation, Shares   0 0        
Issuance of common stock pursuant to employee stock purchase plan 673 $ 0 $ 0 673 0 0 0
Shares issued pursuant to employee stock purchase plan, Shares   0 30,080        
Issuance of common stock for settlement of deferred stock units 0 $ 0 $ 0 0 0 0 0
Issuance of common stock for settlement of deferred stock units, Shares   0 435,026        
Issuance of common stock for vesting of restricted stock units 0 $ 0 $ 0 0 0 0 0
Issuance of common stock for vesting of restricted stock units, Shares   0 231,971        
Issuance of common stock for unvested restricted stock awards 0 $ 0 $ 0 0 0 0 0
Issuance of common stock for unvested restricted stock awards, Shares   0 14,742        
Shares withheld related to net share settlement of stock-based awards (5,565) $ 0 $ 0 (5,565) 0 0 0
Shares withheld related to net share settlement of stock-based awards, shares     (226,009)        
Windfall tax benefit from stock-based award activity 2,711 0 $ 0 2,711 0 0 0
Ending Balance at Dec. 31, 2016 258,854 0 $ 4 85,445 (4) 172,599 810
Ending Balance, Shares at Dec. 31, 2016     37,882,266        
Balance as adjusted at Dec. 31, 2016 258,887 $ 0 $ 4 85,530 (4) 172,547 810
Balance as adjusted, Shares at Dec. 31, 2016   0 37,882,266,000        
Net and comprehensive income 51,654 $ 0 $ 0 0 0 51,524 130
Stock-based compensation 9,145 $ 0 $ 0 9,145 0 0 0
Stock-based compensation, Shares   0 0        
Issuance of common stock pursuant to employee stock purchase plan 653 $ 0 $ 0 653 0 0 0
Shares issued pursuant to employee stock purchase plan, Shares   0 30,209        
Issuance of common stock for settlement of deferred stock units 0 $ 0 $ 0   0 0 0
Issuance of common stock for settlement of deferred stock units, Shares   0 351,801        
Issuance of common stock for vesting of restricted stock units 0 $ 0 $ 0 0 0 0 0
Issuance of common stock for vesting of restricted stock units, Shares   0 284,837        
Issuance of common stock for unvested restricted stock awards 0 $ 0 $ 0 0 0 0 0
Issuance of common stock for unvested restricted stock awards, Shares   0 17,538        
Shares withheld related to net share settlement of stock-based awards (5,451) $ 0 $ 0 (5,451) 0 0 0
Shares withheld related to net share settlement of stock-based awards, shares   0 (192,640)        
Ending Balance at Dec. 31, 2017 314,888 $ 0 $ 4 89,877 (4) 224,071 940
Ending Balance, Shares at Dec. 31, 2017   0 38,374,011        
Cumulative effect of a change in accounting principle, net of tax 33 $ 0 $ 0 85 0 (52) 0
Balance as adjusted at Dec. 31, 2017 314,888 $ 0 $ 4 89,877 (4) 224,084 927
Balance as adjusted, Shares at Dec. 31, 2017   0 38,374,011        
Net and comprehensive income 87,105 $ 0 $ 0 0 0 87,257 (152)
Stock-based compensation 11,983 $ 0 $ 0 11,983 0 0 0
Stock-based compensation, Shares   0 0        
Issuance of common stock pursuant to employee stock purchase plan 621 $ 0 $ 0 621 0 0 0
Shares issued pursuant to employee stock purchase plan, Shares   0 21,001        
Issuance of common stock for settlement of deferred stock units 0 $ 0 $ 0 0 0 0 0
Issuance of common stock for settlement of deferred stock units, Shares   0 237,052        
Issuance of common stock for vesting of restricted stock units 0 $ 0 $ 0 0 0 0 0
Issuance of common stock for vesting of restricted stock units, Shares   0 317,236        
Issuance of common stock for unvested restricted stock awards 0 $ 0 $ 0 0 0 0 0
Issuance of common stock for unvested restricted stock awards, Shares   0 12,852        
Shares withheld related to net share settlement of stock-based awards (5,023) $ 0 $ 0 (5,023) 0 0 0
Shares withheld related to net share settlement of stock-based awards, shares   0 (147,688)        
Ending Balance at Dec. 31, 2018 409,574 $ 0 $ 4 97,458 (4) 311,341 775
Ending Balance, Shares at Dec. 31, 2018   0 38,814,464        
Cumulative effect of a change in accounting principle, net of tax $ 0 $ 0 $ 0 $ 0 $ 0 $ 13 $ (13)