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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 122,121 $ 124,086 $ 120,573
Net income 130,499 119,138 121,274
Other comprehensive (loss):      
Foreign currency translation adjustment, Pre-tax (7,983) 6,836 (2,147)
Foreign currency translation adjustment, Tax 0 0 0
Foreign currency translation adjustment, Net (7,983) 6,836 (2,147)
Gains on cash flow hedging derivatives, Pre-tax 1,150 (1,282) 797
Gains on cash flow hedging derivatives, Tax (276) 468 (291)
Gains on cash flow hedging derivatives, Net 874 (814) 506
Unrealized gain (loss) on marketable securities, Pre-tax 124 183 2,052
Unrealized gain (loss) on marketable securities, Tax (30) (67) (749)
Unrealized gain (loss) on marketable securities, Net 94 116 1,303
Unrealized Gain (Loss) on Cash Flow Hedging Instruments 874 (814) 506
Total Other Comprehensive Income (Loss), Pre-tax (6,709) 5,737 702
Total Other Comprehensive Income (Loss), Tax (306) 401 (1,040)
Total Other Comprehensive Income(Loss), Net (7,015) 6,138 (338)
Comprehensive income 123,484 125,276 120,936
Less: net income attributable to noncontrolling interest $ 1,363 $ 1,190 $ 363