Pension and Other Postretirement Benefits - Plan assets and funded status (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Change in projected benefit obligation (PBO)
Curtailment gain		$ 2,400
Pension Benefits (Underfunded)
Change in projected benefit obligation (PBO)
Projected benefit obligation at beginning of year	$ 271,462	275,022
Service cost	9,787	15,515
Interest cost	11,077	10,962
Actuarial (gain) loss	14,095	199
Settlements	(6,714)
Curtailment gain		(21,567)
Plan amendments		1,331
Benefit payments	(15,515)	(9,203)
Foreign currency translation	122	(797)
Adjustment for movement from underfunded to overfunded	(210)
Projected benefit obligation at end of year	284,104	271,462
Accumulated benefit obligation (ABO) at end of year	247,009	228,830
Change in plan assets
Fair value of plan assets at beginning of year	157,729	159,309
Return on plan assets	7,203	(5,182)
Employer contributions	18,335	12,827
Settlements	(6,714)
Benefit payments	(15,515)	(9,203)
Foreign currency translation	50	(22)
Fair value of plan assets at end of year	161,088	157,729
Funded status (fair value of plan assets less PBO)	(123,016)	(113,733)
Pension Benefits (Overfunded)
Change in projected benefit obligation (PBO)
Projected benefit obligation at beginning of year	38,287	35,998
Service cost		168
Service cost (negative)	(24)
Interest cost	1,279	1,376
Actuarial (gain) loss	7,711	2,920
Participants' contributions		55
Benefit payments	(796)	(575)
Foreign currency translation	(6,932)	(1,655)
Adjustment for movement from underfunded to overfunded	210
Projected benefit obligation at end of year	39,735	38,287
Accumulated benefit obligation (ABO) at end of year	37,289	36,004
Change in plan assets
Fair value of plan assets at beginning of year	43,768	42,269
Return on plan assets	8,280	1,838
Employer contributions	2,012	2,095
Participants' contributions		55
Benefit payments	(796)	(575)
Foreign currency translation	(7,922)	(1,914)
Fair value of plan assets at end of year	45,342	43,768
Funded status (fair value of plan assets less PBO)	5,607	5,481
Postretirement Benefits
Change in projected benefit obligation (PBO)
Projected benefit obligation at beginning of year	20,079	21,089
Service cost	888	1,060
Interest cost	779	787
Actuarial (gain) loss	(572)	(2,228)
Plan amendments	283
Participants' contributions	921	1,068
Benefit payments	(2,114)	(1,697)
Projected benefit obligation at end of year	20,264	20,079
Accumulated benefit obligation (ABO) at end of year	20,264	20,079
Change in plan assets
Employer contributions	1,193	629
Participants' contributions	921	1,068
Benefit payments	(2,114)	(1,697)
Funded status (fair value of plan assets less PBO)	$ (20,264)	$ (20,079)

Changes in the defined benefit obligation related to Adjustment for movement from underfunded to overfunded.

No definition available.

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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contributions made by the employer to defined benefit plans.

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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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.

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Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

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The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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Amount of plan assets that relate to an irrevocable action that relieves the employer, or plan, of primary responsibility for a benefit obligation and eliminates risks related to the obligation and the assets used to effect settlement. Includes, but is not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified pension benefits and purchasing annuity contracts to cover vested benefits.

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