SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 10,111	$ 13,442	$ 600
Charged to Earnings	17,113	5,543	12,842
Recoveries	0	0	0
Uncollectible Accounts Written-off	(9,251)	(8,862)	0
Foreign Currency Translation due to Charges	0	(12)	0
Balance at End of Year	17,973	10,111	13,442
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	3,693	3,811	0
Charged to Earnings	2,100	235	3,811
Recoveries	0	0	0
Uncollectible Accounts Written-off	(273)	(353)	0
Foreign Currency Translation due to Charges	0	0	0
Balance at End of Year	5,520	3,693	3,811
Straight-line rent receivable allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	3,668	5,331	600
Charged to Earnings	10,487	3,540	4,731
Recoveries	0	0	0
Uncollectible Accounts Written-off	(1,800)	(5,191)	0
Foreign Currency Translation due to Charges	0	(12)	0
Balance at End of Year	12,355	3,668	5,331
Loan loss reserves
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	2,750	4,300	0
Charged to Earnings	4,526	1,768	4,300
Recoveries	0	0	0
Uncollectible Accounts Written-off	(7,178)	(3,318)	0
Foreign Currency Translation due to Charges	0	0	0
Balance at End of Year	$ 98	$ 2,750	$ 4,300