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Share Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings Per Share (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]                      
Basic average common shares outstanding                 22,081,026 [1] 23,298,663 [1] 22,913,881 [1]
Incremental shares due to:                      
Restricted stock units                 53,803 24,086 220,457
Performance shares                 129,003 291,036 817,946
Diluted average common shares outstanding                 22,263,832 23,613,785 23,952,284
Basic net earnings per common share $ 3.91 $ 0.60 $ 0.52 $ (0.04) $ 0.86 $ 0.82 $ 0.92 $ 0.16 $ 4.84 $ 2.75 $ 1.73
Diluted net earnings per common share $ 3.87 $ 0.60 $ 0.52 $ (0.04) $ 0.84 $ 0.80 $ 0.91 $ 0.16 $ 4.80 $ 2.72 $ 1.66
Anti-dilutive shares excluded from calculation                 41,337 9,992 88,674
[1] Basic average common shares outstanding include restricted stock awards that are fully vested, but are deferred for future issuance. See Note 14, "Equity-Based Compensation Plans" for further discussion.