Land Rights Land Rights (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Land rights	$ 656,666		$ 656,666		$ 596,921
Less accumulated amortization	(11,063)		(11,063)		(6,163)
Land rights, net	645,603		645,603		590,758
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Land rights, net	645,603		645,603		$ 590,758
Land rights, net
Finite-Lived Intangible Assets [Line Items]
Amortization expense, land rights	2,600	$ 1,500	4,900	$ 1,500
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2017	5,455		5,455
2018	10,910		10,910
2019	10,910		10,910
2020	10,910		10,910
2021	10,910		10,910
Thereafter	$ 596,508		$ 596,508
Land rights, net | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, land rights, remaining amortization period			25 years
Land rights, net | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, land rights, remaining amortization period			92 years