Long-Term Debt (Details 4) $ in Thousands	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Scheduled principal payments in the next twelve months	$ 6,000
Scheduled principal payments, year two	6,000
Scheduled principal payments, year three	125,500
Scheduled principal payments, year four	406,000
Scheduled principal payments, year five	356,000
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	1,417,000
Long term debt and capital lease obligations excluding discount and deferred costs	$ 2,316,500