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Equity-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
May 02, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, shares authorized 60,000,000     60,000,000     60,000,000
Expiration period       10 years      
Compensation cost $ 23,586   $ 11,211 $ 51,690 $ 32,678    
Compensation cost not yet recognized $ 322,900     $ 322,900      
Compensation cost not yet recognized, period       2 years 8 months 12 days      
Employee Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted   166,000   341,000      
Employee Stock Option [Member] | Vesting over 2 Years [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted   34,000          
Vesting period   2 years          
Vesting percentage   50.00%          
Employee Stock Option [Member] | Vesting over 4 Years [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted   132,000          
Vesting period   4 years          
Vesting percentage   25.00%          
Employee Performance Based Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted   166,000          
Employee Performance Based Stock Option [Member] | Vesting over 2 Years [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted   34,000          
Vesting period   2 years          
Vesting percentage   50.00%          
Employee Performance Based Stock Option [Member] | Vesting over 4 Years [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted   132,000          
Vesting period   4 years          
Vesting percentage   25.00%          
Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted, value per share       $ 3,019.04      
Restricted Stock Units (RSUs) [Member] | Vesting over 2 Years [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period   2 years          
Vesting percentage   50.00%          
Performance Based Restricted Stock Unit [Member] | Vesting over 2 Years [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period   2 years          
Vesting percentage   50.00%          
Two Thousand Eighteen, Equity Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, shares authorized           275,000  
Shares granted   144,000          
Two Thousand Eighteen, Equity Plan [Member] | Employee Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted   72,000          
Two Thousand Eighteen, Equity Plan [Member] | Employee Performance Based Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted   72,000          
Two Thousand Eighteen, Equity Plan [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, shares authorized           40,000  
Two Thousand Ten, Equity Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted   4,000          
Two Thousand Ten, Equity Plan [Member] | Employee Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares issued   332,000          
Shares granted   4,000          
Two Thousand Ten, Equity Plan [Member] | Employee Performance Based Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted   0          
Two Thousand Ten, Equity Plan [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares issued   16,000          
Two Thousand Fourteen, Equity Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted   184,000          
Two Thousand Fourteen, Equity Plan [Member] | Employee Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted   90,000   9,000      
Two Thousand Fourteen, Equity Plan [Member] | Employee Stock Option [Member] | Vesting over 4 Years [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period       4 years      
Vesting percentage       25.00%      
Two Thousand Fourteen, Equity Plan [Member] | Employee Stock Option [Member] | Continued Employment and Return Of Capital Performance [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage       50.00%      
Two Thousand Fourteen, Equity Plan [Member] | Employee Stock Option [Member] | Continued Employment [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage       50.00%      
Two Thousand Fourteen, Equity Plan [Member] | Employee Performance Based Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted   94,000