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Supplemental Consolidated Balance Sheet and Statement of Operations Information - Other Income, Net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Other Nonoperating Income (Expense) [Abstract]        
Interest income $ 168 $ 64 $ 388 $ 209
Income from training reimbursement program 207 247 943 910
Other (177) (13) (345) 33
Nonoperating income (expense) $ 198 $ 298 $ 986 $ 1,152