Accounts Receivable (Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	$ 112	$ 63	$ 171	$ 193
Provisions for losses on accounts receivables, net of recoveries	43	(115)	94	15
Accounts receivable written off, net of recoveries	0	7	(8)	7
Balance, end of period	$ 69	$ 185	$ 69	$ 185