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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Numerator                      
Net income $ 13,936 $ 27,995 $ 31,803 $ 26,173 $ 23,772 $ 21,293 $ 16,463 $ 16,732 $ 99,907 $ 78,260 $ 72,615
Denominator                      
Denominator for basic earnings per share- weighted average shares (in shares) 52,833 52,824 52,803 52,548 52,356 52,278 52,088 51,956 52,754 52,170 51,641
Dilutive effect of unvested restricted common stock (including restricted stock units) and options issued to employees and directors (in shares)                 389 500 708
Denominator for diluted earnings per share (in shares) 53,252 53,203 53,151 52,958 52,821 52,730 52,594 52,533 53,143 52,670 52,349
Earnings per Common Share:                      
Basic net earnings per share (in USD per share) $ 0.26 $ 0.53 $ 0.60 $ 0.50 $ 0.45 $ 0.41 $ 0.32 $ 0.32 $ 1.89 $ 1.50 $ 1.41
Diluted net earnings per share (in USD per share) $ 0.26 $ 0.53 $ 0.60 $ 0.49 $ 0.45 $ 0.40 $ 0.31 $ 0.32 $ 1.88 $ 1.49 $ 1.39