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Stockholders' Equity (Details) (Restricted Stock [Member], USD $)
6 Months Ended
Jun. 30, 2012
Restricted Stock [Member]
 
Schedule of restricted stock activity  
Beginning Balance, Number of shares 380,944
Grants, Number of shares 82,741
Vested shares, Number of shares (20,004)
Forfeitures, Number of shares (907)
Ending Balance, Number of shares 442,774
Beginning Balance, Weighted-average grant price $ 194.26
Grants, Weighted-average grant price $ 111.44
Vested shares, Weighted-average grant price $ 217.77
Forfeitures, Weighted-average grant price $ 132.23
Ending Balance, Weighted-average grant price $ 178.39