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, 2010	$ 303,491	$ 96,325	$ 221	$ 140,418	$ 137,578	$ (71,051)
Shares Outstanding, Beginning 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 - value	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
Common share issuance - shares		0	2,530,000
Net proceeds from issuance of common shares	42,085	0	25	42,060	0	0
Stock options exercised, shares		0	378,674
Stock options exercised - value	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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	151,423	0	0	0	151,423	0
Fair value over carrying value of preferred share redeemed	0	2,190			(2,190)
Dividends paid to preferred shareholders	(3,656)				(3,656)
Common share issuance - shares	2,461,000	0	2,461,000
Net proceeds from issuance of common shares	54,617	0	25	54,592	0	0
Preferred shares redeemed - shares		(2,000)
Preferred share redeemed - value	(50,352)	(50,352)
Stock options exercised, shares	(184,832)	0	184,832
Stock options exercised - value	2,640	0	0	(1,031)	0	3,671
Stock-based compensation expense	2,344	0	0	2,344	0	0
Deferral of executive and director compensation	359	0	0	359	0	0
Executive and director deferred compensation distributions shares		0	24,858
Executive and director deferred compensation distributions	0	0	0	(493)	0	493
Stockholders' Equity, Ending Balance at Dec. 31, 2013	$ 492,803	$ 48,163	$ 271	$ 236,060	$ 262,625	$ (54,316)
Shares Outstanding, Ending Balance at Dec. 31, 2013		2,000	24,357,943