Condensed Consolidated Statement of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Preferred Shares [Member]	Common Shares [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Shares [Member]
Stockholders' Equity, Beginning Balance at Dec. 31, 2012	$ 335,428	$ 96,325	$ 246	$ 180,289	$ 117,048	$ (58,480)
Shares Outstanding, Beginning Balance at Dec. 31, 2012		4,000	21,687,253
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,587				4,587
Fair value over carrying value of preferred shares subject to redemption	0	2,190			(2,190)
Common share issuance	2,461,000		2,461,000
Net proceeds from issuance of common shares	54,617		25	54,592
Preferred shares redeemed during period	2,000	(2,000)
Reclassification of preferred shares subject to redemption	(50,352)	(50,352)
Stock-based compensation expense	519			519
Deferral of executive and director compensation	202			202
Executive and director deferred compensation distributions shares			24,858
Executive and director deferred compensation distributions	0			(493)		493
Stockholders' Equity, Ending Balance at Mar. 31, 2013	$ 345,001	$ 48,163	$ 271	$ 235,109	$ 119,445	$ (57,987)
Shares Outstanding, Ending Balance at Mar. 31, 2013		2,000	24,173,111