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Equity-Based Compensation - Performance Restricted Stock Activity (Details) - 2012 Plan [Member] - Performance Shares [Member] - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Feb. 29, 2016
Sep. 30, 2016
Awards & Units (in shares)    
Unvested at December 31, 2015   90,249
Granted   261,488
Unvested at September 30, 2016 [1]   344,862
Weighted Average Grant-Date Fair Value (in dollars per share)    
Unvested at December 31, 2015   $ 137.14
Granted   103.06
Unvested at September 30, 2016   $ 111.30
Maximum number of units that could be awarded   689,724
Unrecognized compensation cost related to unvested awards   $ 19,868
Unrecognized compensation cost, period of recognition (in years)   1 year 6 months 7 days
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized to be awarded, percent of initial awards received 0.00%  
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized to be awarded, percent of initial awards received 200.00%  
Two-Year [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance shares, performance period   2 years
Awards & Units (in shares)    
Granted 174,325  
Three-Year [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance shares, performance period   3 years
Awards & Units (in shares)    
Granted 87,163  
[1] A maximum of 689,724 units could be awarded based upon the Company’s final TSR ranking.