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, 2011	$ 273,350	$ 96,325	$ 221	$ 139,943	$ 103,701	$ (66,840)
Shares Outstanding, Beginning Balance at Dec. 31, 2011		4,000	18,736,357
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,332				8,332
Stock Issued During Period, Shares, New Issues			2,530,000
Proceeds from Issuance of Common Stock	42,085		25	42,060
Stock options exercised, shares			137,174
Stock options exercised	1,215			(1,510)		2,725
Stock-based compensation expense	1,398			1,398
Deferral of executive and director compensation	112			112
Executive and director deferred compensation distributions shares			34,196
Executive and director deferred compensation distributions	0			(679)		679
Stockholders' Equity, Ending Balance at Sep. 30, 2012	$ 326,492	$ 96,325	$ 246	$ 181,324	$ 112,033	$ (63,436)
Shares Outstanding, Ending Balance at Sep. 30, 2012		4,000	21,437,727