CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net income $ 21,557 $ 24,853
Other comprehensive income (loss):    
Change in foreign currency translation adjustment, net of tax benefit (expense) of $1,560 and $(161) (17,003) 569
Available-for-sale investments:    
Change in net unrealized gain, net of tax expense of $(155) and $(57) 251 93
Less: reclassification adjustment for net gain included in net income, net of tax expense of $(2) and $(1) (3) (2)
Net change, net of tax expense of $(153) and $(56) 248 91
Cash flow hedges:    
Change in unrealized gain, net of tax expense of $(476) and $(550) 771 898
Less: reclassification adjustment for net (gain) loss included in net income, net of tax benefit (expense) of $(137) and $185 (221) 301
Net change, net of tax expense of $(339) and $(735) 550 1,199
Total other comprehensive (loss) income, net of tax effect (16,205) 1,859
Total comprehensive income, net of tax effect $ 5,352 $ 26,712