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Stock-Based Compensation - Roll Forward of Restricted Stock Grants (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Roll-forward of outstanding restricted stock grants issued    
Outstanding shares, Ending Balance 312,099 319,988
Restricted Stock Units (RSUs)
   
Roll-forward of outstanding restricted stock grants issued    
Outstanding shares, Beginning Balance 319,988 260,621
Weighted-Average Grant Date Price per Share, Beginning of Period $ 74.22 $ 73.78
Grants issued 32,000 107,600
Weighted-Average Grant Date Price Per Share, Grants issued $ 85.63 $ 75.64
Grants vested (39,749) (46,056)
Weighted-Average Grant Date Price Per Share, Grants vested $ 80.77 $ 75.22
Grants forfeited (140) (2,177)
Weighted-Average Grant Date Price per Share, Grants forfeited $ 77.81 $ 71.37
Outstanding shares, Ending Balance 312,099 319,988
Weighted-Average Grant Date Price per Share, End of Period $ 74.17 $ 74.22