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Stock Options, Restricted Stock and Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
May 31, 2016
Feb. 29, 2016
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional shares authorized for grants     500,000
Maximum term of the awards granted under the Plan     10 years
Stock-based compensation cost which has not yet been recognized     $ 27.1
Stock-based compensation cost recognized period, in months     31 months
Restricted stock awarded subject to performance condition     606,000
Restricted stock and restricted stock units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional shares authorized for grants 11,365    
Shares authorized for grants   176,802  
Vesting period 3 years    
Share Price $ 49.27 $ 50.67  
Restricted stock and restricted stock units [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   2 years  
Restricted stock and restricted stock units [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   4 years