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							45,220
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Parent		$ 2,526,708	$ 661	$ 2,519,423		$ 8,727	$ (2,103)
Shares, Outstanding			66,148,609
Issuance of treasury shares			0				64,372
Purchase of treasury shares		(1,460)					$ (1,460)
Issuance of treasury shares		0	$ 0	2,547			$ (2,547)
Net income (loss)		(120,176)				(120,176)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			48,254				0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		4,683	$ 1	4,682			$ 0
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation							(41,787)
Weighted Average Number of Shares Outstanding, Basic	64,835,000
Net income (loss)	$ (35,720)
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0
Shares, Issued							(22,635)
Stockholders' Equity Attributable to Parent		2,409,755	$ 662	2,521,558		(111,449)	$ (1,016)
Shares, Outstanding			66,196,863
Issuance of treasury shares			0				24,604
Purchase of treasury shares		(2,257)			$ (2,257)
Issuance of treasury shares			$ 0	995			$ (995)
Net income (loss)		68,548				68,548
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			148,040				0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		7,575	$ 1	7,574			$ 0
Treasury Stock, Shares, Retired			(2,182)				2,182
Treasury Stock, Retired, Cost Method, Amount				78	$ (78)
Stock Repurchased During Period, Shares					(3,136,406)
Stock Repurchased and Retired During Period, Shares			(2,822,259)		2,822,259
Stock Repurchased During Period, Value		(105,215)			$ (105,215)
Stock Repurchased and Retired During Period, Value			$ (28)	(94,085)	$ 94,113
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation					(54,784)
Shares, Issued							(364,780)
Stockholders' Equity Attributable to Parent		2,378,406	$ 635	2,433,974		(42,901)	$ (13,302)
Shares, Outstanding			63,520,462
Weighted Average Number of Shares Outstanding, Basic	62,547,000
Issuance of treasury shares			0				14,973
Purchase of treasury shares		(157)			$ (157)
Issuance of treasury shares		0	$ 0	614			$ (614)
Net income (loss)	$ 15,908	15,908				15,908
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			10,808				0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		5,866	$ 0	5,866			$ 0
Treasury Stock, Shares, Retired			(995)				995
Treasury Stock, Retired, Cost Method, Amount				32	$ (32)
Stock Repurchased During Period, Shares					(1,228,310)
Stock Repurchased and Retired During Period, Shares			(1,442,457)		1,442,457
Stock Repurchased During Period, Value		(40,268)			$ (40,268)
Stock Repurchased and Retired During Period, Value			$ (14)	(48,536)	$ 48,550
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation					(4,750)
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	32,000
Shares, Issued							139,415
Stockholders' Equity Attributable to Parent		2,359,755	$ 621	2,390,658		(26,993)	$ (4,531)
Shares, Outstanding			62,087,818
Shares, Issued							34,922
Stockholders' Equity Attributable to Parent	$ 2,335,507	2,335,507	$ 617	2,384,309		(47,945)	$ (1,474)
Shares, Outstanding			61,652,412
Issuance of treasury shares			0		69,327
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			39,182,045
Stock Issued During Period, Value, Acquisitions		1,015,312	$ (391)	1,014,921
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			120,952				0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		(5,672)	$ 1	(3,713)			$ 1,958
Treasury Stock, Shares, Retired			(251,287)				251,287
Treasury Stock, Retired, Cost Method, Amount			$ (3)	6,425	$ (6,428)
Stock Repurchased During Period, Shares					(1,266,000)
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					(306,185)
Weighted Average Number of Shares Outstanding, Basic	97,762,000
Net income (loss)	$ (717,630)
Stock Repurchased During Period, Shares					1,300,000
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0
Shares, Issued							(20,493)
Stockholders' Equity Attributable to Parent		2,859,964	$ 994	3,372,711		(512,960)	$ (781)
Shares, Outstanding			99,438,122
Issuance of treasury shares			0				12,200
Purchase of treasury shares		(487)			$ (487)
Issuance of treasury shares		0	$ 0	0			$ 0
Net income (loss)		(221,832)				(221,832)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			212,809				0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		6,364	$ 2	6,164			$ 198
Treasury Stock, Shares, Retired			(39,374)				39,374
Treasury Stock, Retired, Cost Method, Amount				322	$ (322)
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation					(64,219)
Shares, Issued							33,138
Stockholders' Equity Attributable to Parent		2,644,009	$ 996	3,378,553		(734,792)	$ (748)
Shares, Outstanding			99,611,557
Weighted Average Number of Shares Outstanding, Basic	99,617,000
Issuance of treasury shares			0				23,974
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			36,826				0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		5,405	$ 0	5,216			$ 189
Treasury Stock, Shares, Retired			(8,656)				8,656
Treasury Stock, Retired, Cost Method, Amount				121	$ (121)
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation					(16,642)
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0
Shares, Issued							17,150
Stockholders' Equity Attributable to Parent	$ 2,618,399	$ 2,618,399	$ 996	$ 3,383,648		$ (765,575)	$ (670)
Shares, Outstanding			99,639,727