Earnings (Loss) Per Share Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 77,389	$ 63,774
Earnings (loss) per common share - Basic:
Net income	$ 0.80	$ 0.65
Effect of Dilutive Securities [Abstract]
Convertible Securities	66	66
Stock options, warrants and awards	0	0
Convertible Securities (in shares)	6,028	8,463
Stock options, warrants and awards, common shares (in shares)	446	738
Income from continuing operations plus assumed conversions	77,455	63,704
Earnings (loss) per common share - Diluted:
Net income plus assumed conversions	77,455	63,840
Diluted shares	103,195	107,767
Diluted earnings per share	$ 0.75	$ 0.59
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	77,389	63,638
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.80	$ 0.65
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 0	$ 136
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.00	$ 0.00
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	$ 0.00	$ 0.00
Income (Loss) from Continuing Operations, Per Diluted Share	$ 0.75	$ 0.59
Weighted Average Number of Shares Outstanding, Basic	96,721	98,566