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Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Numerator                      
Net income $ 11,090 $ 31,641 $ 32,195 $ (5,531) $ 13,936 $ 27,995 $ 31,803 $ 26,173 $ 69,395 $ 99,907 $ 78,260
Denominator                      
Denominator for basic earnings per share - weighted average shares (in shares) 53,009 52,999 52,993 52,881 52,833 52,824 52,803 52,548 52,976 52,754 52,170
Dilutive effect of unvested restricted common stock and options issued to employees and directors (in shares)                 386 389 500
Denominator for diluted earnings per share (in shares) 53,419 53,359 53,345 52,881 53,252 53,203 53,151 52,958 53,362 53,143 52,670
Earnings per Common Share:                      
Basic net earnings per share (in USD per share) $ 0.21 $ 0.60 $ 0.61 $ (0.10) $ 0.26 $ 0.53 $ 0.60 $ 0.50 $ 1.31 $ 1.89 $ 1.50
Diluted net earnings per share (in USD per share) $ 0.21 $ 0.59 $ 0.60 $ (0.10) $ 0.26 $ 0.53 $ 0.60 $ 0.49 $ 1.30 $ 1.88 $ 1.49