Earnings per Share Basic and Diluted EPS (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerators:
Income from continuing operations, net of tax	$ 82,572	$ 22,244
Loss from discontinued operations, net of tax	(9)	(3)
Less: Series A-1 Preferred Stock dividend	2,139	0
Net income available to common stockholders	$ 80,424	$ 22,241
Denominators:
Weighted average common shares outstanding - Basic	51,332,000	40,360,000
Dilutive effect of employee stock grants	513,000	556,000
Dilutive effect of Series A-1 Preferred Stock	2,925,000	0
Weighted average shares - Diluted	56,496,000	43,081,000
Basic:
Earnings per common share from continuing operations	$ 1.57	$ 0.55
Loss per common share from discontinued operations	$ 0.00	$ 0.00
Earnings per common share	$ 1.57	$ 0.55
Diluted:
Earnings per common share from continuing operations	$ 1.46	$ 0.52
Loss per common share from discontinued operations	$ 0.00	$ 0.00
Earnings per common share	$ 1.46	$ 0.52
Class A common shares [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted average shares impact resulting from offerings during the period	3,791,004
Class B common shares [Member]
Denominators:
Weighted average common shares outstanding - Basic	1,726,000	2,165,000