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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 124,086 $ 120,573 $ 94,277
Net income 119,138 121,274 113,655
Other comprehensive income (loss):      
Foreign currency translation adjustment, Pre-tax 6,836 (2,147) (18,734)
Foreign currency translation adjustment, Tax 0 0 0
Foreign currency translation adjustment, Net 6,836 (2,147) (18,734)
Gains on cash flow hedging derivatives, Pre-tax (1,282) 797 1,962
Gains on cash flow hedging derivatives, Tax 468 (291) (716)
Gains on cash flow hedging derivatives, Net (814) 506 1,246
Unrealized gain (loss) on marketable securities, Pre-tax 183 2,052 (1,847)
Unrealized gain (loss) on marketable securities, Tax (67) (749) 674
Unrealized gain (loss) on marketable securities, Net 116 1,303 (1,173)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments (814) 506 1,246
Total Other Comprehensive Income (Loss), Pre-tax 5,737 702 (18,619)
Total Other Comprehensive Income (Loss), Tax 401 (1,040) (42)
Total Other Comprehensive Income(Loss), Net 6,138 (338) (18,661)
Comprehensive income 125,276 120,936 94,994
Net Income (Loss) Attributable to Noncontrolling Interest $ 1,190 363 717
Comprehensive income attributable to non-controlling interests   $ (363) $ (717)