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Stock Options, Restricted Stock and Restricted Stock Units (Details) - 6 months ended Jun. 30, 2015 - Restricted stock and restricted stock units [Member] - $ / shares
Total
Schedule of restricted stock and restricted stock units activity  
Beginning Balance, Number of shares 524,216
Grants, Number of shares 126,655
Vested shares, Number of shares (13,725)
Forfeitures, Number of shares (1,731)
Ending Balance, Number of shares 635,415
Beginning Balance, Weighted-average grant price $ 115.67
Grants, Weighted-average grant price 61.00
Vested shares, Weighted-average grant price 52.94
Forfeitures, Weighted-average grant price 115.55
Ending Balance, Weighted-average grant price $ 104.64