Accounts Receivable and Other Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 38,433	$ 61,045
Less: allowance for doubtful accounts	(55)	(103)
Accounts receivable, net	38,378	60,942
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts, beginning of the year	103	124	$ 348
Charged to costs and expenses	(34)	(17)	(75)
Less: write-offs, net of recoveries	(14)	(4)	(149)
Remaining allowance, end of the year	55	103	$ 124
Other receivables	$ 4,161	$ 11,304