Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 12,919	$ 17,112	$ 16,116
Additions	0	1,775	1,912
Deductions	4,944	5,968	916
Balance at End of Year	$ 7,975	$ 12,919	$ 17,112