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Equity-Based Compensation Compensation Plans (Details)
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
$ / shares
shares
Jun. 30, 2018
$ / shares
shares
Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding at beginning of period (Shares)   916
Shares granted 166 340
Exercised (Shares)   (91)
Forfeited (Shares)   (27)
Outstanding at end of period (Shares) 1,138 1,138
Exercisable at end of period (Shares) 371 371
Outstanding at beginning of period (Weighted Average Exercise Price) $ / shares | $ / shares   $ 1,119.92
Granted (Weighted Average Exercise Price) $ / shares | $ / shares   3,023.76
Exercised (Weighted Average Exercise Price) $ / shares | $ / shares   949.64
Forfeited (Weighted Average Exercise Price) $ / shares | $ / shares   1,300.09
Outstanding at end of period (Weighted Average Exercise Price) $ / shares | $ / shares $ 1,697.50 1,697.50
Exercisable at end of period (Weighted Average Exercise Price) $ / shares | $ / shares $ 959.65 $ 959.65
Two Thousand Ten, Equity Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted 4  
Shares granted 16  
Two Thousand Ten, Equity Plan [Member] | Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted 4  
Two Thousand Ten, Equity Plan [Member] | Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding at beginning of period (Shares)   10
Shares granted 8 16
Vested (Shares)   (5)
Forfeited (Shares)   0
Outstanding at end of period (Shares) 21 21
Vested, but not issued at end of period (Shares) 0 0