Accounts Receivable (Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	$ 115	$ 171
Provisions for losses on accounts receivables, net of recoveries	123	(51)
Accounts receivable written off, net of recoveries	0	(8)
Balance, end of period	$ 238	$ 112