7. Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts Receivable Details
Trade accounts receivable	$ 60,564	$ 42,565
Less allowance for prompt pay discounts	(1,844)	(893)
Less allowance for doubtful accounts	(15)	(228)
Total trade receivables, net	58,705	41,444
Receivables from third parties	1,594	2,601
Other miscellaneous receivables	910	82
Total accounts receivable, net	$ 61,209	$ 44,127