Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term debt, carrying value	$ 717,715	$ 626,628
Related Party Debt	85,000	85,000
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term debt fair value	763,900	613,700
Related Party Debt, Fair Value	88,400	84,100
Senior notes | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term debt fair value	545,100	492,600
Mortgage loans | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term debt fair value	$ 218,800	$ 121,100