Net Income Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Earnings Per Share, Basic and Diluted [Abstract]
Net income	$ 18,847		$ 13,594		$ 35,323		$ 23,874
Weighted Average Common Shares	54,353,811		40,333,269		51,930,581		36,762,811
Effect of dilutive stock options on income	0		0		0		0
Effect of dilutive stock options on weighted average common shares	0		1,138		0		2,209
Diluted, Income	$ 18,847		$ 13,594		$ 35,323		$ 23,874
Diluted, Weighted Average Number Common Shares	54,353,811		40,334,407		51,930,581		36,765,020
Basic	$ 0.35		$ 0.34		$ 0.68		$ 0.65
Diluted	$ 0.35	[1]	$ 0.34	[1]	$ 0.68	[2]	$ 0.65	[2]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	15,000		15,000		15,000		15,000

[1] For the three months ended June 30, 2012 and June 30, 2011, the calculation of diluted net income per common share excludes the effect of 15,000 unexercised stock option awards because their inclusion would have been anti-dilutive.

[2] For the six months ended June 30, 2012, the calculation of diluted net income per common share excludes the effect of 15,000 unexercised stock option awards because their inclusion would have been anti-dilutive.