Pension and Postretirement Benefits - Amounts recognized in accumulated other comprehensive income (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Amounts recognized in accumulated other comprehensive income
Total	$ 13,476	$ 11,259
US Postretirement Benefit Plans
Amounts recognized in accumulated other comprehensive income
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	5,571	4,692
Prior service credit	(2,729)	(2,038)
Subtotal	2,842	2,654
Less tax effect	(1,078)	(1,006)
Total	1,764	1,648
Pension Plans \| Funded Plans
Amounts recognized in accumulated other comprehensive income
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	9,442	6,972
Prior service credit	0	0
Subtotal	9,442	6,972
Less tax effect	(3,581)	(2,644)
Total	5,861	4,328
Pension Plans \| Unfunded Pension Plans
Amounts recognized in accumulated other comprehensive income
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	4,020	3,480
Prior service credit	0	0
Subtotal	4,020	3,480
Less tax effect	(1,525)	(1,320)
Total	2,495	2,160
US Postretirement and Pension Plan
Amounts recognized in accumulated other comprehensive income
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	19,033	15,144
Prior service credit	(2,729)	(2,038)
Subtotal	16,304	13,106
Less tax effect	(6,184)	(4,970)
Total	$ 10,120	$ 8,136

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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- Definition

The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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- Definition

The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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Defined benefit plan accumulated other comprehensive income loss tax.

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