Earnings per Share Basic and Diluted EPS (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerators:
Income/(loss) from continuing operations, net of tax	$ 65,712,000	$ (19,567,000)	$ 213,062,000	$ 39,064,000
Loss from discontinued operations, net of tax	(25,000)	0	(43,000)	(27,000)
Less: Series A-1 Preferred Stock dividend	0	0	2,139,000	0
Net income/(loss) available to common stockholders	$ 65,687,000	$ (19,567,000)	$ 210,880,000	$ 39,037,000
Denominators:
Weighted average common shares outstanding - Basic	54,626,000	41,682,000	53,475,000	40,888,000
Dilutive effect of employee stock-based awards	462,000	0	506,000	478,000
Dilutive effect of Series A-1 Preferred Stock	0	0	964,000	0
Weighted average shares - diluted	56,738,000	41,682,000	56,637,000	43,471,000
Basic:
Earnings/(loss) per common share from continuing operations	$ 1.20	$ (0.47)	$ 3.94	$ 0.96
Loss per common share from discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Earnings/(loss) per common share	$ 1.20	$ (0.47)	$ 3.94	$ 0.95
Diluted:
Earnings/(loss) per common share from continuing operations	$ 1.16	$ (0.47)	$ 3.76	$ 0.90
Loss per common share from discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Earnings/(loss) per common share	$ 1.16	$ (0.47)	$ 3.76	$ 0.90
Class A common shares [Member]
Denominators:
Weighted average common shares outstanding - Basic	54,626,000	41,682,000	53,475,000	40,888,000
Class B common shares [Member]
Denominators:
Weighted average common shares outstanding - Basic	1,650,000	0	1,692,000	2,105,000