Earnings per Share Basic and Diluted EPS (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Numerators:
Income from continuing operations, net of tax	$ 64,779	$ 36,387	$ 147,350	$ 58,631
Loss from discontinued operations, net of tax	(9)	(24)	(18)	(27)
Less: Series A-1 Preferred Stock dividend	0	0	2,139	0
Net income available to common stockholders	$ 64,770	$ 36,363	$ 145,193	$ 58,604
Denominators:
Weighted average common shares outstanding - Basic	54,434	40,614	52,891	40,487
Dilutive effect of employee stock grants	542	427	574	490
Dilutive effect of Series A-1 Preferred Stock	0	0	1,455	0
Weighted average shares - diluted	56,676	43,153	56,633	43,116
Basic:
Earnings per common share from continuing operations	$ 1.19	$ 0.90	$ 2.75	$ 1.45
Loss per common share from discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Earnings per common share	$ 1.19	$ 0.90	$ 2.75	$ 1.45
Diluted:
Earnings per common share from continuing operations	$ 1.14	$ 0.84	$ 2.60	$ 1.36
Loss per common share from discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Earnings per common share	$ 1.14	$ 0.84	$ 2.60	$ 1.36
Class B common shares [Member]
Denominators:
Weighted average common shares outstanding - Basic	1,700	2,112	1,713	2,139