Other Income, Net (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Other Income and Expenses [Abstract] | ||||
| Interest income | $ 400 | $ 38 | $ 579 | $ 83 |
| Other nonoperating expense | (231) | (156) | (46) | |
| Other nonoperating income | 16 | |||
| Insurance policy (expense) income | (32) | 221 | (32) | 166 |
| Other income, net | $ 137 | $ 103 | $ 563 | $ 203 |