Pension Benefit Plans - Components of Pension Expense and Other Postretirement Benefit Expense(Details) - HNH - Pension Plans, Defined Benefit - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Defined Benefit Plans Disclosure [Line Items] | ||||
| Service cost | $ 0 | $ 9 | $ 0 | $ 9 |
| Interest cost | 5,720 | 6,404 | 17,705 | 16,828 |
| Expected return on plan assets | (7,342) | (7,520) | (22,184) | (19,550) |
| Administrative costs | 314 | 315 | 894 | 504 |
| Amortization of actuarial loss | 1,990 | 1,482 | 6,240 | 4,672 |
| Total | $ 682 | $ 690 | $ 2,655 | $ 2,463 |