Accounts Receivable (Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	$ 238	$ 112	$ 115	$ 171
Provisions for losses on accounts receivables, net of recoveries	(165)	(43)	(42)	(94)
Accounts receivable written off, net of recoveries	0	0	0	(8)
Balance, end of period	$ 73	$ 69	$ 73	$ 69