Leases - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Year	$ 1,501	$ 1,473
Additions: Charged Against Operations	4,459	53
Deductions: Uncollectible Accounts Written Off	(5,289)	(25)
Balance at End of Year	$ 671	$ 1,501