Stockholders' Equity (Comprehensive Income) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ 1,815,314
Ending Balance	1,783,034
Change in Unrealized Gain (Loss) on Derivatives
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(919)	$ 3,619
Other comprehensive (loss) income before reclassifications, before tax	189	(7,587)
Tax expense (benefit)	(45)	1,821
Other comprehensive (loss) income before reclassifications, net of tax	144	(5,766)
Reclassification of loss (gain) from accumulated other comprehensive income, before tax	(645)	3,644
Reclassification of tax expense (benefit)	156	(538)
Reclassification of loss (gain) from accumulated other comprehensive income, after tax	(489)	3,106
Net current-period other comprehensive (loss) income, net of tax	(345)	(2,660)
Ending Balance	(1,264)	959
Foreign Currency Translation Adjustments Gain (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	46,232	(72,106)
Other comprehensive (loss) income before reclassifications, before tax	(38,590)	72,017
Tax expense (benefit)	0	0
Other comprehensive (loss) income before reclassifications, net of tax	(38,590)	72,017
Reclassification of loss (gain) from accumulated other comprehensive income, before tax	(9,011)	0
Reclassification of tax expense (benefit)	0	0
Reclassification of loss (gain) from accumulated other comprehensive income, after tax	(9,011)	0
Net current-period other comprehensive (loss) income, net of tax	(47,601)	72,017
Ending Balance	(1,369)	(89)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	45,313	(68,487)
Other comprehensive (loss) income before reclassifications, before tax	(38,401)	64,430
Tax expense (benefit)	(45)	1,821
Other comprehensive (loss) income before reclassifications, net of tax	(38,446)	66,251
Reclassification of loss (gain) from accumulated other comprehensive income, before tax	(9,656)	3,644
Reclassification of tax expense (benefit)	156	(538)
Reclassification of loss (gain) from accumulated other comprehensive income, after tax	(9,500)	3,106
Net current-period other comprehensive (loss) income, net of tax	(47,946)	69,357
Ending Balance	$ (2,633)	$ 870

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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