Property and Equipment - Fixed Assets Roll forward (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Total Property and Equipment
Cost	$ 119,518	$ 119,100
Accumulated Depreciation	19,408	15,958
Carrying Value	100,110	103,142
Property leased to others under operating leases included in property and equipment
Cost	113,008	113,008
Accumulated Depreciation	13,308	10,197
Carrying Value	99,700	102,811
Land
Total Property and Equipment
Cost	21,120	21,120
Accumulated Depreciation	0	0
Carrying Value	21,120	21,120
Property leased to others under operating leases included in property and equipment
Cost	21,120	21,120
Accumulated Depreciation	0	0
Carrying Value	21,120	21,120
Site improvements
Total Property and Equipment
Cost	91,308	91,308
Accumulated Depreciation	13,261	10,161
Carrying Value	78,047	81,147
Property leased to others under operating leases included in property and equipment
Cost	91,308	91,308
Accumulated Depreciation	13,261	10,161
Carrying Value	78,047	81,147
Buildings
Total Property and Equipment
Cost	580	580
Accumulated Depreciation	47	36
Carrying Value	533	544
Property leased to others under operating leases included in property and equipment
Cost	580	580
Accumulated Depreciation	47	36
Carrying Value	533	544
Leasehold improvements
Total Property and Equipment
Cost	154	104
Accumulated Depreciation	107	102
Carrying Value	47	2
Property leased to others under operating leases included in property and equipment
Cost	0	0
Accumulated Depreciation	0	0
Carrying Value	0	0
Furniture and equipment
Total Property and Equipment
Cost	1,070	993
Accumulated Depreciation	965	901
Carrying Value	105	92
Property leased to others under operating leases included in property and equipment
Cost	0	0
Accumulated Depreciation	0	0
Carrying Value	0	0
Computer hardware
Total Property and Equipment
Cost	5,286	4,995
Accumulated Depreciation	5,028	4,758
Carrying Value	258	237
Property leased to others under operating leases included in property and equipment
Cost	0	0
Accumulated Depreciation	0	0
Carrying Value	$ 0	$ 0