Supplemental Consolidated Balance Sheet and Statement of Operations Information - Other Income and (Expense), Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Other Nonoperating Income (Expense) [Abstract]
Interest income	$ 83	$ 15
Income from training reimbursement program	433	66
Other	60	(147)
Nonoperating income (expense)	$ 576	$ (66)