Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ (3,388)	$ (1,619)	$ (1,049)
Provision for doubtful accounts	1,515	3,111	1,600
Write-off of accounts receivable against allowance	(2,258)	(1,342)	(1,022)
Other	188	0	(8)
Ending balance	(2,833)	(3,388)	(1,619)
Valuation Allowance, Operating Loss Carryforwards [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	5,979	0	0
Valuation Allowances and Reserves, Period Increase (Decrease)	2,232	(5,979)	0
Ending balance	$ (3,747)	$ 5,979	$ 0