Consolidated Statements of Operations and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
|
| Income Statement [Abstract] | ||||
| Prior service cost, tax | $ 25 | $ 26 | $ 50 | $ 53 |
| Actuarial (gain) loss, tax | 832 | $ (5) | 1,664 | $ (10) |
| Unrealized loss on cash flow hedge, tax | $ 11 | $ 21 | ||