Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings (Accumulated Deficit) [Member]
Balance, Value at Dec. 31, 2010	$ 211,056	$ 446	$ 296,253	$ (1,768)	$ (83,875)
Balance, Shares at Dec. 31, 2010		44,645,435
Net income	77,448				77,448
Other Comprehensive Income (Loss)	9,668			9,668
Stock Compensation	837		837
Issuance of Common Stock in public offering, net of related expenses, Shares		6,210,000
Issuance of Common Stock in public offering, net of related expenses, Value	178,279	62	178,217
Issuance of Common Stock through exercise of options, Shares		41,000
Issuance of Common Stock through exercise of options, Value	397	1	396
Issuance of Restricted Stock, Shares		47,819
Issuance of Restricted Stock, Value		0	0
Balance, Value at Sep. 30, 2011	477,685	509	475,703	7,900	(6,427)
Balance, Shares at Sep. 30, 2011		50,944,254
Balance, Value at Dec. 31, 2011	632,350	556	604,584	2,663	24,547
Balance, Shares at Dec. 31, 2011	55,621,371	55,621,371
Net income	52,488				52,488
Other Comprehensive Income (Loss)	(7,638)			(7,638)
Stock Compensation	3,427		3,427
Issuance of Common Stock through exercise of options, Shares
Issuance of Restricted Stock, Shares		96,331
Issuance of Restricted Stock, Value		1	(1)
Balance, Value at Sep. 30, 2012	$ 680,627	$ 557	$ 608,010	$ (4,975)	$ 77,035
Balance, Shares at Sep. 30, 2012	55,717,702	55,717,702