Schedule II: Valuation and Qualifying Accounts (Details) - Allowance Accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Movement in Valuation Allowances and Reserves
Balance at the beginning of the year	$ 169,374	$ 29,518	$ 36,180
Additions
Amounts Charged Against Operations, net	4,105	144,135	1,177
Acquired Properties	0	0	0
Deductions
Uncollectible Accounts Written-off	(1,887)	(2,732)	(2,843)
Dispositions	(143,795)	(1,547)	(4,996)
Balance at the end of the year	$ 27,797	$ 169,374	$ 29,518