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Summary of Significant Accounting Policies (Details 7) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
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, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic:                              
Net income for the period $ 19,823 $ 26,923 $ 11,866 $ 25,153 $ 21,040 $ 21,984 $ 16,183 $ 34,275 $ 30,068 $ 25,357 $ 20,452 $ 28,366 $ 83,765 $ 93,482 $ 104,243
Weighted average number of common shares during the period (in thousands) 41,093 [1] 41,092 [1] 41,082 [1] 41,297 [1] 41,564 [1] 41,852 [1] 41,990 [1] 41,950 [1] 41,748 [1] 41,514 [1] 41,432 [1] 41,180 [1] 41,158,349 41,914,864 41,646,281
Net income per share - basic $ 0.48 $ 0.66 $ 0.29 $ 0.61 $ 0.51 $ 0.53 $ 0.39 $ 0.82 $ 0.72 $ 0.61 $ 0.49 $ 0.69 $ 2.04 $ 2.23 $ 2.5
Diluted:                              
Net income for the period $ 19,823 $ 26,923 $ 11,866 $ 25,153 $ 21,040 $ 21,984 $ 16,183 $ 34,275 $ 30,068 $ 25,357 $ 20,452 $ 28,366 $ 83,765 $ 93,482 $ 104,243
Weighted average number of common shares during the period (in thousands) 41,093 [1] 41,092 [1] 41,082 [1] 41,297 [1] 41,564 [1] 41,852 [1] 41,990 [1] 41,950 [1] 41,748 [1] 41,514 [1] 41,432 [1] 41,180 [1] 41,158,349 41,914,864 41,646,281
Weighted average number of common equivalent shares to reflect the dilutive effect of common stock equivalent securities (in thousands):                              
Stock options                         100 158 137
Common stock units related to deferred compensation for employees                         52 55 70
Restricted common stock units related to incentive compensation                         166 297 378
Total common and common equivalent shares adjusted to calculate diluted earnings per share (in thousands) 41,482 [1] 41,347 [1] 41,314 [1] 41,492 [1] 42,127 [1] 42,305 [1] 42,425 [1] 42,300 [1] 42,362 [1] 42,319 [1] 42,310 [1] 42,259 [1] 41,475,516 42,424,806 42,230,559
Net income per share - diluted $ 0.48 $ 0.65 $ 0.29 $ 0.61 $ 0.50 $ 0.52 $ 0.38 $ 0.81 $ 0.71 $ 0.60 $ 0.48 $ 0.67 $ 2.02 $ 2.2 $ 2.47
[1] Rounded to thousands.