Statement of Shareholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Common Stock, Value, Issued at Dec. 31, 2010	$ 292,340,000	$ 1,283,000	$ 114,000	$ 536,991,000	$ (6,207,000)	$ (242,690,000)	$ 2,849,000
Common Stock, Shares, Outstanding at Dec. 31, 2010		49,739,912				4,218,726
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, Stock Options Exercised	(297,000)	0	(1,672,000)	0	0	(1,969,000)	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period						(42,400)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		0				(177,271)
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(17,165,000)	0	(9,588,000)	(1,992,000)	0	(9,569,000)	0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	2,559,000	0	2,559,000	0	0	0	0
Stock Repurchased During Period, Value	(61,825,000)	0	0	0	0	(61,825,000)	0
Stock Repurchased During Period, Shares		0				669,649
Dividends	(46,027,000)	0	0	(46,027,000)	0	0	0
Treasury Stock, Retired, Cost Method, Amount	0	(21,000)	0	(40,894,000)	0	(40,915,000)	0
Treasury Stock, Shares, Retired		(702,106)				(702,106)
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	8,864,000	0	8,864,000	0	0	0	0
Stock Issued During Period, Shares, Conversion of Convertible Securities		0				(1,851,869)
Stock Issued During Period, Value, Conversion of Convertible Securities	(2,322,000)	0	(13,603,000)	(90,192,000)		(101,473,000)	0
Settlement of Warrants	(219,451,000)	0	(3,724,000)	(258,910,000)	0	(43,183,000)	0
Settlement of Warrants, Shares		0				(706,395)
Noncontrolling Interest, Increase from Equity Issuance or Sale of Parent Equity Interest	1,194,000	0	0	0	0	0	1,194,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(251,000)	0	0	0	0	0	(251,000)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax	4,468,000	0	0	0	(4,468,000)	0	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	184,644,000	0	0	184,684,000	0	0
Net Income (Loss) Attributable to Noncontrolling Interest	(40,000)						(40,000)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	189,112,000
Common Stock, Value, Issued Period End at Dec. 31, 2011	181,655,000	1,262,000	2,126,000	283,660,000	(1,739,000)	(107,406,000)	3,752,000
Common Stock, Shares, Outstanding Period End at Dec. 31, 2011		49,037,806				1,408,334
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, Stock Options Exercised	(5,000)	0	(60,000)	0	0	(65,000)	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period						(1,042)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		0				(299,964)
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(18,381,000)	0	(276,000)	(6,530,000)	0	(24,635,000)	0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	5,226,000	0	5,226,000	0	0	0	0
Stock Repurchased During Period, Value	(175,732,000)	0	0	0	0	(175,732,000)	0
Stock Repurchased During Period, Shares		0				1,581,069
Dividends	(52,950,000)	0	0	(52,950,000)	0	0	0
Treasury Stock, Retired, Cost Method, Amount	0	(29,000)	(7,568,000)	(78,996,000)	0	(86,593,000)	0
Treasury Stock, Shares, Retired		(1,138,224)				(1,138,224)
Settlement of Warrants	0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(110,000)	0	0	0	0	0	(110,000)
Noncontrolling Interest, Increase from Equity Issuance or Sale of Parent Equity Interest	1,800,000	0	0	0	0	0	1,800,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	300,000	0	0	0	0	0	300,000
Stockholders' Equity, Other Shares		2				0
Stockholders' Equity, Other	0	0	0	0	0	0	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(6,674,000)	0	0	0	6,674,000	0	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	216,612,000	0	0	216,071,000	0	0
Net Income (Loss) Attributable to Noncontrolling Interest	541,000						541,000
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	209,938,000
Common Stock, Value, Issued Period End at Dec. 31, 2012	187,913,000	1,233,000	0	361,255,000	(8,413,000)	(171,845,000)	5,683,000
Common Stock, Shares, Outstanding Period End at Dec. 31, 2012	46,349,411	47,899,584				1,550,173
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, Stock Options Exercised	(83,000)	0	(1,411,000)	0	0	(1,494,000)	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(12,000)					(12,000)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		0				(222,176)
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(20,526,000)	0	(1,047,000)	(5,509,000)	0	(24,988,000)	0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	3,744,000	0	3,744,000	0	0	0	0
Stock Repurchased During Period, Value	(227,216,000)	0	0	0	0	(227,216,000)	0
Stock Repurchased During Period, Shares		0				1,482,198
Dividends	(58,642,000)	0	0	(58,642,000)	0	0	0
Treasury Stock, Retired, Cost Method, Amount	0	(30,000)	(3,380,000)	(123,985,000)	0	(127,395,000)	0
Treasury Stock, Shares, Retired	(1,149,582)	(1,149,582)				(1,149,582)
Settlement of Warrants	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	213,000	0	0	0	(213,000)	0	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	243,194,000	0	0	242,811,000	0	0
Net Income (Loss) Attributable to Noncontrolling Interest	383,000						383,000
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	242,981,000
Common Stock, Value, Issued Period End at Dec. 31, 2013	$ 169,389,000	$ 1,203,000	$ 0	$ 415,930,000	$ (8,626,000)	$ (245,184,000)	$ 6,066,000
Common Stock, Shares, Outstanding Period End at Dec. 31, 2013	45,101,389	46,750,002				1,648,613