Schedule II (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Period	$ 2,498	$ 2,181	$ 2,282
Additions Charged to Costs and Expenses / Provision Benefit	788	767	746
Additions Other	0	0	0
Deductions	(2,040)	(450)	(847)
Balance End of Period	1,246	2,498	2,181
Valuation Allowance of Deferred Tax Assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Period	8,243	4,944	3,831
Additions Charged to Costs and Expenses / Provision Benefit	2,046	3,472	772
Additions Other			341
Deductions	(2,147)	(173)
Balance End of Period	$ 8,142	$ 8,243	$ 4,944