Segment Information Balance Sheet Data (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	$ 69,702	$ 80,472	$ 83,743	$ 32,319
Property and equipment, net	4,613,849	4,656,921
North American Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	14,458	13,584
Property and equipment, net	3,657,483	3,657,801
Australia Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	37,606	52,407
Property and equipment, net	631,919	664,367
U.K./European Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	17,638	14,481
Property and equipment, net	$ 324,447	$ 334,753