Schedule II-Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ 4,294	$ 7,391	$ 6,679
Additions	692	1,152	1,032
Deductions		(4,249)	(320)
Ending Balance	4,986	4,294	7,391
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance		258	578
Additions	200
Deductions		(258)	(320)
Ending Balance	200		258
Valuation Allowance for Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	4,294	7,133	6,101
Additions	492	1,152	1,032
Deductions		(3,991)
Ending Balance	$ 4,786	$ 4,294	$ 7,133