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 Receivable
Valuation Allowances and Reserves
Balance at Beginning of Period	$ 1	$ 12	$ 231
Charged to Costs and Expenses	37	7	(140)
Charged to Other Accounts	0	0	0
Deductions	(28)	(18)	(79)
Balance at End of Period	10	1	12
Valuation Allowance of Deferred Tax Assets
Valuation Allowances and Reserves
Balance at Beginning of Period	4,850	2,872	2,203
Charged to Costs and Expenses	3,394	1,978	1,049
Charged to Other Accounts	0	0	0
Deductions	(83)	0	(380)
Balance at End of Period	$ 8,161	$ 4,850	$ 2,872