Consolidated Stockholders' Equity - USD ($) $ in Thousands	Total	Accumulated Translation Adjustment [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Accumulated Defined Benefit Plans Adjustment [Member]	Accumulated Defined Benefit Plans Adjustment [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Derivative [Member]	Derivative [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Interest Rate Swap [Member]	Interest Rate Swap [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Foreign Exchange Contract [Member]	Foreign Exchange Contract [Member] Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	$ 2,045,158		$ 50	$ 848,372	$ 0	$ (60,972)	$ 1,257,708
Balance, Shares Outstanding			50,123,035
Net (Loss) Income	206,256						206,256
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(3,315)					(3,315)
Other Comprehensive Income (Loss), Net of Tax	42,064							$ 44,014	$ (44,014)	$ 1,481	$ 1,481				$ (116)
Stock Issued During Period, Value, Conversion of Convertible Securities	$ 14,002		$ 2	14,000
Shares issued to settle the conversion benefit of the notes (in shares)	2,290,755
Treasury Stock, Shares, Acquired	(300,000)
Treasury Stock, Value, Acquired, Cost Method	$ (19,134)				(19,134)
Stock Issued During Period, Value, Stock Options Exercised	$ 290			290	0		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	18,170
Dividends, Cash	$ (8,344)						(8,344)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	$ 6,306		0	6,306
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	61,413
Adjustments Related to Tax Withholding for Share-based Compensation	$ (2,726)			(2,726)	0
Shares Paid for Tax Withholding for Share Based Compensation	(34,353)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	$ 39			39
Balance	2,283,911		$ 52	866,281	(19,134)	(18,908)	1,455,620
Balance, Shares Outstanding			52,159,020
Net (Loss) Income	238,697						238,697
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(46,949)					(46,949)
Other Comprehensive Income (Loss), Net of Tax	(180,002)	$ (46,949)						(128,800)	128,800		$ (3,156)	$ (3,156)			(1,097)
Stock Issued During Period, Value, Conversion of Convertible Securities	$ (19,387)		$ (1)	(19,386)
Shares issued to settle the conversion benefit of the notes (in shares)	0
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature	$ 2,725			2,725
Treasury Stock, Shares, Acquired	(2,923,011)
Treasury Stock, Value, Acquired, Cost Method	$ (184,380)				(184,380)
Stock Issued During Period, Value, Stock Options Exercised	$ 720			720	0		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	45,782
Dividends, Cash	$ (8,100)						(8,100)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	$ 1,272		0	1,272
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	1,600
Adjustments Related to Tax Withholding for Share-based Compensation	$ (673)			(673)	0
Shares Paid for Tax Withholding for Share Based Compensation	(10,338)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	$ 1,001			1,001
Balance	2,135,784		$ 51	851,940	(203,514)	(198,910)	1,686,217
Balance, Shares Outstanding			49,273,053
Net (Loss) Income	(1,047,960)						(1,047,960)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(12,065)					(12,065)
Other Comprehensive Income (Loss), Net of Tax	$ (148,252)	$ (12,065)						$ (136,024)	$ 136,024			$ (1,146)	$ (1,146)	$ 983	$ 983
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0
Dividends, Cash	$ (7,889)						(7,889)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	$ 2,657		$ 0	(590)	3,247
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	36,598
Adjustments Related to Tax Withholding for Share-based Compensation	$ (96)			(96)	0
Shares Paid for Tax Withholding for Share Based Compensation	(1,528)
Stock Issued During Period, Shares, Employee Stock Purchase Plans	20,876
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 700			(152)	852
Balance	$ 934,944		$ 51	$ 851,102	$ (199,415)	$ (347,162)	$ 630,368
Balance, Shares Outstanding			49,328,999