|
Pension Benefits and Other Postretirement Benefit Plans (Components of Net Periodic Benefit Cost) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
| Pension Benefits [Member] | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Interest cost | $ 1,839 | $ 2,018 |
| Expected return on plan assets | (2,771) | (3,227) |
| Amortization of net loss | 413 | 183 |
| Settlement charge | 110 | |
| Net periodic benefit cost (income) | (519) | (916) |
| Retirement Health and Life Insurance Benefits [Member] | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Service cost | 150 | 160 |
| Interest cost | 75 | 83 |
| Amortization of prior service cost | 0 | |
| Amortization of net loss | 31 | |
| Net periodic benefit cost (income) | $ 225 | $ 274 |