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 |