Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowances for Accounts Receivable
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 3,705	$ 3,688	$ 3,245
Charged to Operations	3,243	5,974	4,705
Write-Offs, Net of Recoveries	(3,729)	(5,957)	(4,262)
Other Changes	0	0	0
Balance at End of Period	3,219	3,705	3,688
Valuation Allowance for Deferred Tax Assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1,189	1,076	46,454
Charged to Operations	36,224	113	(3,007)
Write-Offs, Net of Recoveries	0	0	(43,333)
Other Changes	(68)	0	962
Balance at End of Period	$ 37,345	$ 1,189	$ 1,076