Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Income Statement [Abstract] | ||||
| Reclassification adjustments to cash flow hedges included in net income, net of tax of $0.5 million, $0.5 million, $1.6 million, and $1.6 million | $ 500 | $ 500 | $ (1,600) | $ (1,600) |
| Amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of $1.0 million, $1.4 million, $3.1 million, and $4.2 million | 1,000 | 1,400 | (3,100) | (4,200) |
| Changes in unfunded employee benefit obligation net of tax of $2.0 million | $ 0 | $ 0 | $ 2,000 | $ 0 |