Schedule II - Valuation and Qualifying Accounts Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ (1,619)	$ (1,049)	$ (1,157)
Provision for doubtful accounts	2,261	1,600	1,147
Write-off of accounts receivable against allowance	(1,342)	(1,022)	(1,276)
Other	0	(8)	21
Ending balance	(2,538)	(1,619)	(1,049)
Valuation Allowance, Operating Loss Carryforwards [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	0	0	0
Valuation Allowances and Reserves, Period Increase (Decrease)	(5,979)	0	0
Ending balance	$ (5,979)	$ 0	$ 0