Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Mar. 09, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term debt, carrying value	$ 626,628		$ 1,299,105
Due to Related Parties	84,100
Related Party Debt	85,000
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term debt fair value	613,700		1,300,000
Long-term debt, carrying value	626,600		1,300,000
Senior notes | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term debt fair value			1,000,000
Senior notes | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term debt fair value	492,600
Debt Instrument, Repurchase Amount		$ 539,000
Mortgage loans | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term debt fair value	$ 121,100		$ 236,200