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							(38,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Parent		$ 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)
Net income (loss)	$ (96,073)
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
Net income (loss)	(87,037)	(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			$ 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
Shares, Issued							(55,000)
Stockholders' Equity Attributable to Parent	2,910,247	2,910,247	$ 965	3,161,941		(249,954)	$ (2,705)
Shares, Outstanding			96,468,000
Issuance of treasury shares					67,000
Purchase of treasury shares		(9,203)			$ (9,203)
Issuance of treasury shares		0		0	0
Net income (loss)		(31,960)				(31,960)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			655,000				0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		5,474	$ 7	1,798			$ 3,669
Treasury Stock, Shares, Retired			(53,000)				53,000
Treasury Stock, Retired, Cost Method, Amount			$ (2)	(3,022)	$ 3,024
Stock Repurchased and Retired During Period, Shares			(1,320,000)		1,320,000
Stock Repurchased During Period, Value		(85,339)			$ (85,339)
Stock Repurchased and Retired During Period, Value			$ (13)	(83,508)	$ 83,521
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation					(164,000)
Stock Repurchased During Period, Shares					(1,326,000)
Dividends, Common Stock		(24,468)		(24,468)
Net income (loss)	630,421
Dividends, Common Stock	59,100
Shares, Issued							(105,000)
Stockholders' Equity Attributable to Parent		2,764,751	$ 957	3,052,741		(281,914)	$ (7,033)
Shares, Outstanding			95,750,000
Issuance of treasury shares							5,000
Dividends	(34,658)
Purchase of treasury shares		(7,657)			$ (7,657)
Issuance of treasury shares		0		0			$ 0
Net income (loss)	662,381	662,381				662,381
Stock Issued During Period, Shares, Acquisitions			4,007,000
Stock Issued During Period, Value, Acquisitions		293,314	$ 40	293,274
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture			337,000				0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		7,296	$ 3	6,924			$ 369
Treasury Stock, Shares, Retired			(101,000)				101,000
Treasury Stock, Retired, Cost Method, Amount			$ (1)	(7,635)	$ 7,636
Stock Repurchased and Retired During Period, Shares			(2,946,000)		2,946,000
Stock Repurchased During Period, Value		(214,706)			$ (214,706)
Stock Repurchased and Retired During Period, Value	0		$ (29)	(214,123)	$ 214,152
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation					(101,000)
Stock Repurchased During Period, Shares					(2,966,000)
Shares, Issued							(120,000)
Stockholders' Equity Attributable to Parent	$ 3,470,721	$ 3,470,721	$ 970	$ 3,096,523		$ 380,467	$ (7,239)
Shares, Outstanding			97,047,000