Accounts Receivable (Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	$ 69	$ 185	$ 171	$ 193
Provisions for losses on accounts receivables, net of recoveries	54	(51)	(40)	(66)
Accounts receivable written off, net of recoveries	0	0	(8)	7
Balance, end of period	$ 123	$ 134	$ 123	$ 134