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Interest Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Interest and Debt Expense [Abstract]      
Interest incurred on debt $ 100,844 $ 24,060 $ 20,408
Interest expense - affiliate 5,090 0 0
Redemption Premium 4,782 0 0
Accretion Expense on Extinguished Debt 19,414 6,454 6,305
Accretion of original issue discount on 2018 Term Loans 1,455 0 0
Amortization of debt issuance costs 3,476 309 201
Total interest expense $ 135,061 $ 30,823 $ 26,914
Effective interest rate, revolving credit facility 6.02% 4.57%  
Stated interest rate 6.375%    
Accelerated Accretion $ 18,700    
Accelerated Amortization of Debt Issuance Costs $ 300