Schedule II Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 1,854	$ 5,262	$ 5,164
Charged to costs and expenses	3,220	338	765
Charged to other accounts	1,090	(523)	(537)
Deductions	231	3,223	130
Balance at end of period	$ 5,933	$ 1,854	$ 5,262