Pension and Postretirement Benefits - Summary of funded status of the plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Funded Plans
Change in benefit obligation:
Benefit obligation at beginning of year	$ 13,435	$ 15,348
Service cost	0	0
Interest cost	644	608
Recognized net actuarial loss	2,700	(1,530)
Plan amendments	0	0
Benefits paid	(767)	(991)
Benefit obligation at end of year	16,012	13,435
Change in plan assets:
Fair value of plan assets at beginning of year	10,872	10,624
Actual return on plan assets	364	580
Company contributions	729	659
Benefits paid	(767)	(991)
Fair value of plan assets at end of year	11,198	10,872
Funded status at end of year	(4,814)	(2,563)
Unfunded Pension Plans
Change in benefit obligation:
Benefit obligation at beginning of year	10,536	11,570
Service cost	87	66
Interest cost	435	422
Recognized net actuarial loss	649	(856)
Plan amendments	0	0
Benefits paid	(580)	(666)
Benefit obligation at end of year	11,127	10,536
Change in plan assets:
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Company contributions	580	666
Benefits paid	(580)	(666)
Fair value of plan assets at end of year	0	0
Funded status at end of year	(11,127)	(10,536)
Postretirement Benefit Plans
Change in benefit obligation:
Benefit obligation at beginning of year	16,919	18,701
Service cost	129	156
Interest cost	640	663
Recognized net actuarial loss	1,011	(1,631)
Plan amendments	(1,283)	(40)
Benefits paid	(1,181)	(930)
Benefit obligation at end of year	16,235	16,919
Change in plan assets:
Fair value of plan assets at beginning of year	520	1,397
Actual return on plan assets	(34)	(135)
Company contributions	695	188
Benefits paid	(1,181)	(930)
Fair value of plan assets at end of year	0	520
Funded status at end of year	(16,235)	(16,399)
US Postretirement Benefit Plans
Change in benefit obligation:
Service cost	129	156	146
Interest cost	640	663	814
Recognized net actuarial loss	166	518	547
Change in plan assets:
Fair value of plan assets at beginning of year	520
Fair value of plan assets at end of year		520
Foreign Pension Plans
Change in benefit obligation:
Service cost	413	534	491
Interest cost	631	702	737
Recognized net actuarial loss	145	248	201
Change in plan assets:
Fair value of plan assets at beginning of year	11,560
Fair value of plan assets at end of year	11,747	11,560
Foreign Pension Plans \| Funded Plans
Change in benefit obligation:
Benefit obligation at beginning of year	11,460	15,387
Service cost	413	534
Interest cost	507	582
Recognized net actuarial loss	(1,042)	473
Benefits paid	(344)	(3,644)
Translation adjustment	(1,062)	(926)
Benefit obligation at end of year	12,016	11,460
Change in plan assets:
Fair value of plan assets at beginning of year	11,560	12,997
Actual return on plan assets	983	1,148
Company contributions	604	1,892
Benefits paid	(344)	(3,644)
Translation adjustment	(1,056)	(833)
Fair value of plan assets at end of year	11,747	11,560
Funded status at end of year	(269)	100
Foreign Pension Plans \| Unfunded Pension Plans
Change in benefit obligation:
Benefit obligation at beginning of year	2,911	3,032
Service cost	0	0
Interest cost	124	120
Recognized net actuarial loss	(234)	(44)
Benefits paid	(211)	(219)
Translation adjustment	(302)	(66)
Benefit obligation at end of year	2,756	2,911
Change in plan assets:
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets		0
Company contributions	211	219
Benefits paid	(211)	(219)
Translation adjustment		0
Fair value of plan assets at end of year	0	0
Funded status at end of year	$ (2,756)	$ (2,911)

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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-Name Accounting Standards Codification

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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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The increase in the fair value of plan assets from contributions made by the employer.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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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 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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