Stockholders' Equity And Earnings Per Share (Reconciliation Of Numerators And Denominators Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stockholders' Equity And Earnings Per Share [Abstract]
Net income/(loss), Income (Numerator)	$ 27,701	$ 26,084	$ 24,302	$ 22,063	$ 18,111	$ 17,272	$ 1,923	$ (25,741)	$ 100,150	$ 11,565	$ (67,390)
Dividends on preferred stock	(4,114)	(4,111)	(4,107)	(4,105)	(4,102)	(4,098)	(4,096)	(4,092)	(16,437)	(16,388)	(16,338)
Basic EPS, income/(loss), Income (Numerator)	23,587	21,973	20,195	17,958	14,009	13,174	(2,173)	(29,833)	83,713	(4,823)	(83,728)
Diluted EPS, income/(loss), Income (Numerator)									$ 83,713	$ (4,823)	$ (83,728)
Basic EPS, income/(loss), Shares (Denominator)									78,633,317	77,073,954	52,629,159
Effect of dilutive stock options, Shares (Denominator)									7,335
Diluted EPS, income/(loss), Shares (Denominator)									78,640,652	77,073,954	52,629,159
Basic EPS, income/(loss), Per Share Amount	$ 0.30	$ 0.28	$ 0.26	$ 0.23	$ 0.18	$ 0.17	$ (0.03)	$ (0.41)	$ 1.06	$ (0.06)	$ (1.59)
Diluted EPS, income/(loss), Per Share Amount	$ 0.30	$ 0.28	$ 0.26	$ 0.23	$ 0.18	$ 0.17	$ (0.03)	$ (0.41)	$ 1.06	$ (0.06)	$ (1.59)