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Debt Obligations (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Obligations    
Total debt $ 295,047 $ 76,918
Less-current portion (10,380) (3,279)
Total long-term portion of debt 284,667 73,639
Revolving credit facility    
Debt Obligations    
Total debt 246,000 50,000
Notes to former owners    
Debt Obligations    
Outstanding balance 48,983 26,813
Other debt    
Debt Obligations    
Total debt $ 64 $ 105