Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Balance at beginning of period		$ 45,413	$ 54,155	$ 95,126
Charged to expenses		0	0	0
Adjustments to valuation accounts		(2,710)	(8,742)	(40,971)
Deductions		0	0	0
Balance at end of period		42,703	45,413	54,155
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance at beginning of period	[1]	$ 20,438	17,066	24,175
Charged to expenses	[1]		9,254	6,641
Adjustments to valuation accounts	[1]		0	0
Deductions	[1]		(5,882)	(13,750)
Balance at end of period	[1]		$ 20,438	$ 17,066

[1] Includes allowances on accounts receivable and straight-line rents.