Earnings Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Earnings Per Share Reconciliation [Abstract]
Net Income Applicable to Common Stock	$ 6,052		$ 62,231		$ 9,190		$ 66,943
Convertible preferred stock dividends	0		1,157		0		2,252
Net income applicable to common stock for calculation of diluted earnings per share	$ 6,052		$ 63,388		$ 9,190		$ 69,195
Weighted average shares outstanding (in shares)	22,928,000	[1]	9,480,000	[1]	22,908,000	[1]	9,374,000	[1]
Restricted stock units (in shares)	305,000		391,000		304,000		376,000
Effect of stock options (in shares)	126,000		84,000		126,000		75,000
Stock units for deferred compensation plan for non-employee directors (in shares)	107,000		123,000		116,000		119,000
Effect of convertible preferred stock (in shares)	0		13,953,000		0		13,953,000
Weighted average shares outstanding for calculation of diluted earnings per share (in shares)	23,466,000		24,031,000		23,454,000		23,897,000
Net income per common share [Abstract]
Basic (in dollars per share)	$ 0.26		$ 6.56		$ 0.40		$ 7.14
Diluted (in dollars per share)	$ 0.26		$ 2.64		$ 0.39		$ 2.90
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)	30,000		60,000		30,000		50,000
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

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