Accounts Receivable (Allowance) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	$ 63	$ 321	$ 193	$ 52
Provisions for losses on accounts receivables	115	(167)	(15)	102
Accounts receivable written off, net of recoveries	7	0	7	0
Balance, end of period	$ 185	$ 154	$ 185	$ 154