Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Details)

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Earnings Per 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 $ 55,775 $ 8,001 $ 63,116 $ 18,438
Weighted-Average Shares, Basic 31,475,610 18,888,080 31,473,065 18,885,368
Weighted-Average Shares, Effect of Dilutive Securities - Options, Warrants and Unvested Restricted Stock 24,193 19,219 16,878 21,801
Weighted-Average Shares, Diluted 31,499,803 18,907,299 31,489,943 18,907,169
Per Share Amount, Effect of Dilutive Securities Options, Warrants and Unvested Restricted Stock     $ (0.01)  
Per Share Amount, Basic $ 1.77 $ 0.42 $ 2.01 $ 0.98
Per Share Amount, Diluted $ 1.77 $ 0.42 $ 2.00 $ 0.98