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Leases - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Aug. 02, 2016
Leases [Line Items]        
Capital lease obligations     $ 93,600 $ 124,300
Operating lease liability $ 18,665 $ 16,900    
Other Current Liabilities        
Leases [Line Items]        
Capital lease obligations     14,100  
Other Long-term Liabilities        
Leases [Line Items]        
Capital lease obligations     $ 79,500  
Seven Year Lease Agreement        
Leases [Line Items]        
Lease agreement term       7 years
Agreed to pay annual fixed demand charge, year one       $ 49,000
Agreed to pay annual fixed demand charge, year two       49,000
Agreed to pay annual fixed demand charge, year five and thereafter       $ 45,000