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Stock Options, Restricted Stock and Restricted Stock Units (Details) (Restricted Stock [Member], USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock [Member]
     
Schedule of restricted stock activity      
Beginning Balance, Number of shares 434,439 380,944 341,440
Grants, Number of shares 225,741 82,741 74,868
Vested shares, Number of shares (51,916) (26,189) (17,574)
Forfeitures, Number of shares (120,491) (3,057) (17,790)
Ending Balance, Number of shares 487,773 434,439 380,944
Beginning Balance, Weighted-average grant price $ 178.88 $ 194.26 $ 204.89
Grants, Weighted-average grant price $ 57.90 $ 111.44 $ 130.96
Vested shares, Weighted-average grant price $ 164.22 $ 195.58 $ 131.31
Forfeitures, Weighted-average grant price $ 140.30 $ 127.51 $ 155.01
Ending Balance, Weighted-average grant price $ 131.51 $ 178.88 $ 194.26