Earnings Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Earnings Per Share Reconciliation [Abstract]
Net Income Applicable to Common Stock	$ 62,231		$ 3,241		$ 66,943		$ 5,689
Convertible preferred stock dividends	1,157		1,092		2,252		2,148
Net income applicable to common stock for calculation of diluted earnings per share	$ 63,388		$ 4,333		$ 69,195		$ 7,837
Weighted average shares outstanding (in shares)	9,480,000	[1]	8,607,000	[1]	9,374,000	[1]	8,570,000	[1]
Effect of convertible preferred stock (in shares)	13,953,000		31,987,000		13,953,000		31,987,000
Restricted stock units (in shares)	391,000		140,000		376,000		140,000
Stock units for deferred compensation plan for non-employee directors (in shares)	123,000		58,000		119,000		41,000
Effect of stock options (in shares)	84,000		7,000		75,000		0
Weighted average shares outstanding for calculation of diluted earnings per share (in shares)	24,031,000		40,799,000		23,897,000		40,738,000
Net income (loss) per common share [Abstract]
Basic (in dollars per share)	$ 6.56	[1]	$ 0.38	[1]	$ 7.14	[1]	$ 0.66	[1]
Diluted (in dollars per share)	$ 2.64		$ 0.11		$ 2.90		$ 0.19
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of diluted loss per share (in shares)	60,000		40,000		50,000		200,000
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	346,154		346,154		346,154		346,154

[1] Basic net income per common share includes weighted average common shares outstanding during the period and participating share awards.