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Summary of Significant Accounting Policies (Details 7) - 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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Basic:                              
Net income for the period $ 21,040 $ 21,984 $ 16,183 $ 34,275 $ 30,068 $ 25,357 $ 20,452 $ 28,366 $ 34,287 $ 23,599 $ 25,995 $ 27,012 $ 93,482 $ 104,243 $ 110,893
Weighted average number of common shares during the period 41,564,000 41,852,000 41,990,000 41,950,000 41,748,000 41,514,000 41,432,000 41,180,000 40,818,000 40,001,000 39,768,000 39,527,000 41,914,864 41,646,281 40,376,562
Net income per share - basic $ 0.51 $ 0.53 $ 0.39 $ 0.82 $ 0.72 $ 0.61 $ 0.49 $ 0.69 $ 0.84 $ 0.59 $ 0.65 $ 0.68 $ 2.23 $ 2.5 $ 2.75
Diluted:                              
Net income for the period $ 21,040 $ 21,984 $ 16,183 $ 34,275 $ 30,068 $ 25,357 $ 20,452 $ 28,366 $ 34,287 $ 23,599 $ 25,995 $ 27,012 $ 93,482 $ 104,243 $ 110,893
Weighted average number of common shares during the period 41,564,000 41,852,000 41,990,000 41,950,000 41,748,000 41,514,000 41,432,000 41,180,000 40,818,000 40,001,000 39,768,000 39,527,000 41,914,864 41,646,281 40,376,562
Weighted average number of common equivalent shares to reflect the dilutive effect of common stock equivalent securities (in thousands):                              
Stock options                         158,000 137,000 211,000
Common stock units related to deferred compensation for employees                         55,000 70,000 112,000
Restricted common stock units related to incentive compensation                         297,000 378,000 933,000
Total common and common equivalent shares adjusted to calculate diluted earnings per share 42,127,000 42,305,000 42,425,000 42,300,000 42,362,000 42,319,000 42,310,000 42,259,000 42,205,000 41,732,000 41,395,000 41,088,000 42,424,806 42,230,559 41,633,240
Net income per share - diluted $ 0.50 $ 0.52 $ 0.38 $ 0.81 $ 0.71 $ 0.60 $ 0.48 $ 0.67 $ 0.81 $ 0.57 $ 0.63 $ 0.66 $ 2.20 $ 2.47 $ 2.66