Postretirement Benefits (Details 6) $ in Thousands |
12 Months Ended | |
---|---|---|
Dec. 31, 2017
USD ($)
|
Dec. 31, 2016
USD ($)
|
|
Fair value of plan assets: | ||
Fair value of plan assets, beginning of year | $ 592,544 | $ 551,491 |
Actual gain on plan assets | 108,618 | 38,028 |
Employer contributions | 61,102 | 17,418 |
Benefits paid | (16,184) | (14,393) |
Settlements | (2,180) | |
Fair value of plan assets, end of year | $ 743,900 | $ 592,544 |
Supplemental employee retirement plan (SERP) | Nonqualified plan | Unfunded plan | ||
Fair value of plan assets: | ||
Number of former plan participants resulting in charges recognized as settlements | 2 |
X | ||||||||||
- Definition The number of former plan participants for which settlement charges were recognized. No definition available.
|
X | ||||||||||
- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
X | ||||||||||
- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Details
|
X | ||||||||||
- Details
|
X | ||||||||||
- Details
|