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Earnings Per Common Share - Computation Of Basic And Diluted Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income (Numerator)                      
Net income $ 9,134 $ 17,086 $ 16,288 $ 15,516 $ 15,472 $ (22,182) $ 13,921 $ 14,639 $ 58,024 $ 21,850 $ 47,129
Basic earnings per common share                 58,024 21,850 47,129
Diluted earnings per common share                 $ 58,024 $ 21,850 $ 47,129
Shares (Denominator)                      
Basic earnings per common share (in shares)                 71,826,000 70,616,000 69,206,000
Effect of dilutive securities, options and unvested restricted stock (in shares)                 686,000 725,000 839,000
Diluted earnings per common share (in shares)                 72,512,000 71,341,000 70,045,000
Per-share Amount                      
Basic earnings per common share (in dollars per share) $ 0.13 $ 0.24 $ 0.23 $ 0.22 $ 0.22 $ (0.31) $ 0.20 $ 0.21 $ 0.81 $ 0.31 $ 0.68
Effect of dilutive securities, options and unvested restricted stock (in dollars per share)                 (0.01) 0.00 (0.01)
Diluted earnings per common share (in dollars per share) $ 0.13 $ 0.24 $ 0.23 $ 0.22 $ 0.22 $ (0.31) $ 0.20 $ 0.21 $ 0.80 $ 0.31 $ 0.67
Options outstanding to purchase common stock excluded from computation of diluted earnings per common share (in shares)                 918,000 516,000 546,000