Earnings (Loss) Per Share Data (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings (loss) per common share - Basic:
Income from continuing operations	$ 61,425	$ 37,784	$ 135,856	$ 123,220
Loss from discontinued operations	0	(9,900)	0	(67,479)
Net income (loss)	61,425	27,884	135,856	55,741
Common shares (in shares)	109,315,000	112,729,000	110,457,000	113,443,000
Basic earnings per share, continuing operations (per share)	$ 0.56	$ 0.34	$ 1.23	$ 1.09
Basic earnings per share, discontinued operations (per share)	$ 0.00	$ (0.09)	$ 0.00	$ (0.59)
Net income	$ 0.56	$ 0.25	$ 1.23	$ 0.49
Effect of Dilutive Securities [Abstract]
Convertible Securities	71	72	213	216
Stock options, warrants and awards	0	0	0	0
Convertible Securities (in shares)	2,107,000	1,382,000	2,912,000	644,000
Stock options, warrants and awards, common shares (in shares)	529,000	533,000	599,000	843,000
Earnings (loss) per common share - Diluted:
Income from continuing operations plus assumed conversions	61,496	37,856	136,069	123,436
Loss from discontinued operations	0	(9,900)	0	(67,479)
Net income plus assumed conversions	61,496	27,956	136,069	55,957
Diluted shares (in shares)	111,951,000	114,644,000	113,968,000	114,930,000
Diluted earnings per share, continuing operations plus assumed conversions (per share)	$ 0.55	$ 0.33	$ 1.19	$ 1.07
Income from Discontinued operations plus assumed conversions	$ 0	$ (9,900)	$ 0	$ (67,479)
Diluted earnings per share, discontinued operations (per share)	$ 0.00	$ (0.09)	$ 0.00	$ (0.59)
Diluted earnings per share (per share)	$ 0.55	$ 0.24	$ 1.19	$ 0.49
Aggregate number of stock options, warrants and awards excluded from the computation of diluted EPS (in shares)	2,100,000	2,700,000