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Business Combinations - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2018
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]              
Drawdown from existing revolving credit facility       $ 8,800   $ 87,650 $ 0
Derivative loss           29,000  
Hermes              
Business Acquisition [Line Items]              
Remaining interest contributed to employee benefit trust 10.50%            
Hermes | BTPS              
Business Acquisition [Line Items]              
Ownership interest retained 29.50%            
Hermes              
Business Acquisition [Line Items]              
Payments to acquire business     $ 344,300   $ 343,500    
Cash received from acquisition   $ 800          
Drawdown from existing revolving credit facility $ 18,000            
Transaction costs expensed           13,300  
Foreign exchange gain           $ 1,700  
Increase in Intangible Assets   43,800          
Increase in Other Long-Term Assets   5,000          
Increase in Long-Term Deferred Tax Liability   8,200          
Decrease in Goodwill   $ 41,800          
Revenue     100,800 198,300      
Net income     $ 9,600 $ 10,400