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Summary of Significant Accounting Policies (Details 6) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Basic - assumes no dilution:                              
Net income for the period $ 31,826 $ 32,266 $ 13,103 $ 26,671 $ 32,913 $ 23,637 $ (11,851) $ 25,807 $ 14,592 $ 19,886 $ 23,381 $ 22,272 $ 103,866 $ 70,506 $ 80,131
Shares of common stock - weighted average (1) 39,339 39,381 39,544 39,794 39,900 39,919 39,893 39,749 39,514 39,411 39,263 39,206 39,513,540 39,865,815 39,349,656
Net income (loss) per share - basic $ 0.81 $ 0.82 $ 0.33 $ 0.67 $ 0.82 $ 0.59 $ (0.30) $ 0.65 $ 0.37 $ 0.50 $ 0.60 $ 0.57 $ 2.63 $ 1.77 $ 2.04
Diluted - assumes full dilution:                              
Net income for the period $ 31,826 $ 32,266 $ 13,103 $ 26,671 $ 32,913 $ 23,637 $ (11,851) $ 25,807 $ 14,592 $ 19,886 $ 23,381 $ 22,272 $ 103,866 $ 70,506 $ 80,131
Shares of common stock - weighted average (1) 39,339 39,381 39,544 39,794 39,900 39,919 39,893 39,749 39,514 39,411 39,263 39,206 39,513,540 39,865,815 39,349,656
Weighted average number of common equivalent shares to reflect the dilutive effect of common stock equivalent securities (in thousands):                              
Stock options                         222,000 206,000 255,000
Common stock units related to deferred compensation for Directors                         112,000 114,000 107,000
Common stock units related to deferred compensation for Employees                         116,000 115,000 195,000
Restricted common stock units related to incentive compensation                         1,424,000 1,136,000 1,106,000
Total common and common equivalent shares adjusted to calculate diluted earnings per share (in thousands) 41,272 41,138 41,304 41,546 41,414 41,451 39,893 41,699 41,253 41,115 40,929 40,900 41,388,368 41,436,512 41,013,163
Net income (loss) per share - diluted $ 0.77 $ 0.78 $ 0.32 $ 0.64 $ 0.79 $ 0.57 $ (0.30) $ 0.62 $ 0.35 $ 0.48 $ 0.57 $ 0.54 $ 2.51 $ 1.70 $ 1.95