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, 2009	$ 326,763	$ 96,325	$ 221	$ 137,492	$ 163,847	$ (71,122)
Shares Outstanding, Beginning Balance at Dec. 31, 2009		4,000	18,520,736
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(26,269)	0	0	0	(26,269)	0
Excess tax benefit from stock-based payment arrangements	(13)			(13)
Net proceeds from issuance of common shares	0
Stock options exercised, shares		0	1,600
Stock options exercised	12	0	0	(19)	0	31
Stock-based compensation expense	2,811	0	0	2,811	0	0
Deferral of executive and director compensation	187	0	0	187	0	0
Executive and director deferred compensation distributions shares		0	1,999
Executive and director deferred compensation distributions	0	0	0	(40)	0	40
Stockholders' Equity, Ending Balance at Dec. 31, 2010	303,491	96,325	221	140,418	137,578	(71,051)
Shares Outstanding, Ending Balance at Dec. 31, 2010		4,000	18,524,335
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(33,877)	0	0	0	(33,877)	0
Excess tax benefit from stock-based payment arrangements	233			233
Net proceeds from issuance of common shares	0
Stock options exercised, shares		0	190,090
Stock options exercised	1,500	0	0	(2,275)	0	3,775
Stock-based compensation expense	1,866	0	0	1,866	0	0
Deferral of executive and director compensation	137	0	0	137	0	0
Executive and director deferred compensation distributions shares		0	21,932
Executive and director deferred compensation distributions	0	0	0	(436)	0	436
Stockholders' Equity, Ending Balance at Dec. 31, 2011	273,350	96,325	221	139,943	103,701	(66,840)
Shares Outstanding, Ending Balance at Dec. 31, 2011		4,000	18,736,357
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	13,347	0	0	0	13,347	0
Stock Issued During Period, Shares, New Issues		0	2,530,000
Net proceeds from issuance of common shares	42,085	0	25	42,060	0	0
Stock options exercised, shares	(378,674)	0	378,674
Stock options exercised	4,762	0	0	(2,759)	0	7,521
Stock-based compensation expense	1,734	0	0	1,734	0	0
Deferral of executive and director compensation	150	0	0	150	0	0
Executive and director deferred compensation distributions shares		0	42,222
Executive and director deferred compensation distributions	0	0	0	(839)	0	839
Stockholders' Equity, Ending Balance at Dec. 31, 2012	$ 335,428	$ 96,325	$ 246	$ 180,289	$ 117,048	$ (58,480)
Shares Outstanding, Ending Balance at Dec. 31, 2012		4,000	21,687,253