Revenues, Future Minimum Rentals and Remaining Performance Obligations (Details) - Majority Shareholder [Member] $ in Thousands	Jun. 30, 2018 USD ($)
Future Minimum Rentals to be Received on Noncancelable Lease Agreements
Remainder of 2018	$ 182,120
2019	361,282
2020	362,268
2021	361,282
2022	361,282
Thereafter	2,914,596
Total minimum rental payments	4,542,830
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Future revenues expected to be recognized for our remaining performance obligations from contracts with our customer	40,924
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Future revenues expected to be recognized for our remaining performance obligations from contracts with our customer	81,215
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Future revenues expected to be recognized for our remaining performance obligations from contracts with our customer	81,426
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Future revenues expected to be recognized for our remaining performance obligations from contracts with our customer	81,215
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Future revenues expected to be recognized for our remaining performance obligations from contracts with our customer	81,215
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Future revenues expected to be recognized for our remaining performance obligations from contracts with our customer	116,994
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Future revenues expected to be recognized for our remaining performance obligations from contracts with our customer	$ 482,989