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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)

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