Valuation Allowances and Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]
Allowance for Doubtful Accounts Receivable, beginning of period	$ 969	$ 1,656	$ 2,518
Valuation Allowances and Reserves, Charged to Cost and Expense	760	599	199
Valuation Allowances and Reserves, Charged to Other Accounts	0	0	0
Valuation Allowances and Reserves, Deductions	859	1,286	1,061
Allowance for Doubtful Accounts Receivable, end of period	$ 870	$ 969	$ 1,656