| Condensed Consolidated Statements of Net and Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | |
|---|---|---|
| Mar. 31, 2014 | Mar. 31, 2013 | |
| Income Statement [Abstract] | ||
| Foreign currency translation gain, tax | $ 30 | $ 0 | 
| X | ||||||||||
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- Details 
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| X | ||||||||||
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- Definition Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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