Employee Benefit Plans - Other Compensation Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Classification of liabilities in the Consolidated Balance Sheets
Current liabilities	$ 857	$ 837
Total liabilities	3,909	4,160
Plan expenses	700	700	$ 600
Accrued compensation
Classification of liabilities in the Consolidated Balance Sheets
Current liabilities	857	837
Other long-term liabilities
Classification of liabilities in the Consolidated Balance Sheets
Long-term liabilities	$ 3,052	$ 3,323