Summary of Significant Accounting Policies Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Fixed assets	$ 15,445	$ 16,022
Net operating losses	357	578
Other	213	381
Total deferred tax assets	16,015	16,981
Deferred Tax Liabilities, Capital Improvements	(2,006)	(1,716)
Straight-line receivable	(1,891)	(2,177)
Other	0	(830)
Total deferred tax liabilities	(3,897)	(4,723)
Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction [Abstract]
Current TRS Tax Expense (benefit)	(163)	(36)	$ 0
Current state income tax expense	(360)	(414)	(899)
Current foreign income tax	(36)	(77)	431
Current foreign withholding tax	(1,071)	(1,130)	(1,107)
Deferred TRS Income Tax Expense (Benefit)	137	273	0
Deferred foreign withholding tax	43	39	(43)
Deferred income tax benefit (expense)	(949)	792	1,136
Income tax expense	(2,399)	(553)	$ (482)
Deferred Tax Assets, Net	$ 12,118	$ 12,258