CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2010	$ 582	$ 558,015	$ (2,011)	$ 12,031	$ 568,617
Balance (in shares) at Dec. 31, 2010	58,240,000
Increase (decrease) in stockholders' equity [Roll Forward]
Shares issued to employees, officers and directors	7	2,884			2,891
Shares issued to employees, officers and directors (in shares)	675,000
Stock-based compensation, net		4,490			4,490
Tax effect of stock-based compensation, net		1,235			1,235
Comprehensive Income (loss)			(1,348)	67,394	66,046
Balance at Dec. 31, 2011	589	566,624	(3,359)	79,425	643,279
Balance (in shares) at Dec. 31, 2011	58,915,000
Increase (decrease) in stockholders' equity [Roll Forward]
Shares issued to employees, officers and directors	7	3,500			3,507
Shares issued to employees, officers and directors (in shares)	702,000
Stock-based compensation, net		4,960			4,960
Tax effect of stock-based compensation, net		216			216
Comprehensive Income (loss)			578	61,006	61,584
Balance at Dec. 31, 2012	596	575,300	(2,781)	140,431	713,546
Balance (in shares) at Dec. 31, 2012	59,617,000				59,616,736
Increase (decrease) in stockholders' equity [Roll Forward]
Shares issued to employees, officers and directors	9	4,824			4,833
Shares issued to employees, officers and directors (in shares)	899,000
Stock-based compensation, net		4,733			4,733
Tax effect of stock-based compensation, net		2,383			2,383
Comprehensive Income (loss)			1,440	68,366	69,806
Balance at Dec. 31, 2013	$ 605	$ 587,240	$ (1,341)	$ 208,797	$ 795,301
Balance (in shares) at Dec. 31, 2013	60,516,000				60,515,556