Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Class A Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive (Loss) Income
Beginning Balance at Dec. 31, 2012	$ 857,000	$ 1,000	$ 139,000	$ (642,000)	$ 1,369,000	$ (10,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of Class A common stock	(63,000)			(63,000)
Issuance of treasury shares upon exercise of stock options, purchases under stock purchase plan and grants of restricted stock awards net of cancellations	23,000		(11,000)	34,000
Repurchase share in exchange for the payment of taxes related to the net share settlements of equity awards	(8,000)			(8,000)
Additional tax benefit resulting from exercise of options	2,000		2,000
Equity based compensation	13,000		13,000
Net (loss) income	134,000				134,000
Unrealized loss on anticipated sales hedging transactions (net of income taxes)	0
Unrealized loss on forward interest rate swaps hedging transactions (net of income taxes)	0
Foreign currency translation adjustment	1,000					1,000
Ending Balance at Dec. 31, 2013	959,000	1,000	143,000	(679,000)	1,503,000	(9,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of treasury shares upon exercise of stock options, purchases under stock purchase plan and grants of restricted stock awards net of cancellations	28,000		(22,000)	50,000
Repurchase share in exchange for the payment of taxes related to the net share settlements of equity awards	(5,000)			(5,000)
Additional tax benefit resulting from exercise of options	6,000		6,000
Equity based compensation	20,000		20,000
Net (loss) income	32,000				32,000
Unrealized loss on anticipated sales hedging transactions (net of income taxes)	7,000					7,000
Unrealized loss on forward interest rate swaps hedging transactions (net of income taxes)	(8,000)					(8,000)
Foreign currency translation adjustment	1,000					1,000
Ending Balance at Dec. 31, 2014	1,040,000	1,000	147,000	(634,000)	1,535,000	(9,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of treasury shares upon exercise of stock options, purchases under stock purchase plan and grants of restricted stock awards net of cancellations	17,000		1,000	16,000
Repurchase share in exchange for the payment of taxes related to the net share settlements of equity awards	(13,000)			(13,000)
Additional tax benefit resulting from exercise of options	11,000		11,000
Equity based compensation	31,000		31,000
Net (loss) income	(158,000)				(158,000)
Unrealized loss on anticipated sales hedging transactions (net of income taxes)	(6,000)					(6,000)
Unrealized loss on forward interest rate swaps hedging transactions (net of income taxes)	(7,000)					(7,000)
Foreign currency translation adjustment	(26,000)					(26,000)
Issuance of warrants exercisable for 250,000 shares, exercise price $89.34, expiration April 5, 2017	4,000		4,000
Ending Balance at Dec. 31, 2015	$ 893,000	$ 1,000	$ 194,000	$ (631,000)	$ 1,377,000	$ (48,000)