Consolidated Statement of Equity (Statement) - USD ($) $ in Thousands	Total	Parent [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock, Common [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Shares, Issued							(35,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Parent		$ 2,335,507	$ 617	$ 2,384,309		$ (47,945)	$ (1,474)
Shares, Outstanding			61,652,000
Issuance of treasury shares					69,000
Purchase of treasury shares		(7,693)			$ (7,693)
Issuance of treasury shares		0		0	0
Net income (loss)		(465,015)				(465,015)
Stock Issued During Period, Shares, Acquisitions			39,182,000
Stock Issued During Period, Value, Acquisitions		1,015,312	$ 391	1,014,921
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			121,000				0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		5,672	$ 1	3,713			$ 1,958
Treasury Stock, Shares, Retired			(251,000)				251,000
Treasury Stock, Retired, Cost Method, Amount			$ (3)	(6,425)	$ 6,428
Stock Repurchased and Retired During Period, Shares			(1,266,000)		1,266,000
Stock Repurchased During Period, Value		(23,819)			$ (23,819)
Stock Repurchased and Retired During Period, Value			$ (12)	(23,807)	$ 23,819
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation					(306,000)
Stock Repurchased During Period, Shares					(1,266,000)
Weighted Average Number of Shares Outstanding, Basic	97,762,000
Net income (loss)	$ (717,630)
Stock Repurchased During Period, Shares					(1,300,000)
Shares, Issued							(21,000)
Stockholders' Equity Attributable to Parent		2,859,964	$ 994	3,372,711		(512,960)	$ (781)
Shares, Outstanding			99,438,000
Issuance of treasury shares							13,000
Purchase of treasury shares		(487)			$ (487)
Issuance of treasury shares				0			$ 0
Net income (loss)		(221,832)				(221,832)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			213,000				0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		6,364	$ 2	6,164			$ 198
Treasury Stock, Shares, Retired			(39,000)				39,000
Treasury Stock, Retired, Cost Method, Amount				(322)	$ 322
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation					(64,000)
Shares, Issued							(33,000)
Stockholders' Equity Attributable to Parent		2,644,009	$ 996	3,378,553		(734,792)	$ (748)
Shares, Outstanding			99,612,000
Weighted Average Number of Shares Outstanding, Basic	99,617,000
Issuance of treasury shares			0				24,000
Purchase of treasury shares		232			$ 232
Issuance of treasury shares		0	$ 0	0			$ 0
Net income (loss)	$ (30,783)	(30,783)				(30,783)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			37,000				0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		5,405	$ 0	5,216			$ 189
Treasury Stock, Shares, Retired			9,000				(9,000)
Treasury Stock, Retired, Cost Method, Amount				121	$ (121)
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation					17,000
Shares, Issued							17,000
Stockholders' Equity Attributable to Parent		2,618,399	$ 996	3,383,648		(765,575)	$ (670)
Shares, Outstanding			99,640,000
Shares, Issued							(38,000)
Stockholders' Equity Attributable to Parent	$ 2,615,538	2,615,538	$ 998	3,387,754		(772,265)	$ (949)
Shares, Outstanding			99,759,000
Issuance of treasury shares					65,000
Purchase of treasury shares		(2,356)			$ (2,356)
Issuance of treasury shares		0		0	0
Net income (loss)		(9,036)				(9,036)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			209,000				0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		5,020	$ 2	3,670			$ 1,348
Treasury Stock, Shares, Retired			(33,000)				33,000
Treasury Stock, Retired, Cost Method, Amount			$ 0	(1,091)	$ 1,091
Stock Repurchased and Retired During Period, Shares			(568,000)		568,000
Stock Repurchased During Period, Value		(22,098)			$ (22,098)
Stock Repurchased and Retired During Period, Value			$ (6)	(21,061)	$ 21,067
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation					(81,000)
Stock Repurchased During Period, Shares					(598,000)
Weighted Average Number of Shares Outstanding, Basic	99,018,000
Net income (loss)	$ 49,248
Stock Repurchased During Period, Shares					(2,700,000)
Shares, Issued							(51,000)
Stockholders' Equity Attributable to Parent		2,587,068	$ 994	3,369,272		(781,301)	$ (1,897)
Shares, Outstanding			99,367,000
Issuance of treasury shares							22,000
Dividends	(12,117)
Purchase of treasury shares		(3,300)			$ (3,300)
Issuance of treasury shares		0		0			$ 0
Net income (loss)		(87,037)				(87,037)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			295,000				0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		6,495	$ 3	5,742			$ 750
Treasury Stock, Shares, Retired			(78,000)				78,000
Treasury Stock, Retired, Cost Method, Amount			$ (1)	(2,807)	$ 2,808
Stock Repurchased and Retired During Period, Shares			(677,000)		684,000
Stock Repurchased During Period, Value		(26,509)			$ (26,509)
Stock Repurchased and Retired During Period, Value	$ 306		$ (7)	(26,922)	$ 27,235
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation					(92,000)
Stock Repurchased During Period, Shares					(661,000)
Shares, Issued							(20,000)
Stockholders' Equity Attributable to Parent		2,464,906	$ 989	3,333,168		(868,338)	$ (913)
Shares, Outstanding			98,907,000
Weighted Average Number of Shares Outstanding, Basic	98,183,000
Issuance of treasury shares			0				1,000
Dividends	$ (11,936)
Purchase of treasury shares		180			$ 180
Issuance of treasury shares		0	$ 0	0			$ 0
Net income (loss)	145,321	145,321				145,321
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			12,000				0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		5,779	$ 0	5,730			$ 49
Treasury Stock, Shares, Retired			2,000				(2,000)
Treasury Stock, Retired, Cost Method, Amount				91	$ (91)
Stock Repurchased and Retired During Period, Shares			(1,476,000)		1,476,000
Stock Repurchased During Period, Value		(59,666)			$ (59,666)
Stock Repurchased and Retired During Period, Value	0		$ (15)	(59,610)	$ 59,625
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation					4,000
Stock Repurchased During Period, Shares					(1,476,000)
Shares, Issued							21,000
Stockholders' Equity Attributable to Parent	$ 2,544,224	$ 2,544,224	$ 974	$ 3,267,261		$ (723,017)	$ (994)
Shares, Outstanding			97,441,000