Postretirement Medical Benefits (Details) $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($) Employee	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of former union employees not covered under plan \| Employee	39
Accumulated other comprehensive (income) loss (pre-tax) related to [Abstract]
Estimated net loss expected to be amortized from accumulated other comprehensive income	$ 1,100
Prior service cost (credit) expected to be amortized from accumulated other comprehensive income	(100)
One-percentage-point change in assumed health care cost trend rates [Abstract]
Effect on total of service and interest cost components, 1-Percentage-Point Increase	1
Effect on total of service and interest cost components, 1-Percentage-Point Decrease	(1)
Effect on postretirement benefit obligation, 1-Percentage-Point Increase	26
Effect on postretirement benefit obligation, 1-Percentage-Point Decrease	(34)
Postretirement Benefits [Member]
Net Periodic benefit costs related to retirement plans [Abstract]
Net periodic benefit cost	1,441	$ (939)	$ (1,874)
Summary of expected future benefit payments [Abstract]
2016	2,568
2017	63
2018	59
2019	54
2020	50
Years 2021 - 2025	181
U.S. Postretirement Benefit Plans [Member]
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	4,192	4,960
Service cost	0	1	1
Interest cost	24	26	33
Benefits paid	(833)	(772)
Actuarial loss (gain)	(455)	(23)
Translation adjustment	0	0
Benefit obligation at end of year	2,928	4,192	4,960
(Unfunded) status of the plans	(2,928)	(4,192)
Amounts recognized in the balance sheet [Abstract]
Accrued postretirement benefit liabilities	2,928	4,192
Accumulated other comprehensive (income) loss (pre-tax) related to [Abstract]
Unrecognized net actuarial losses (gains)	970	2,973
Unrecognized prior service cost (credit)	0	0
Net Periodic benefit costs related to retirement plans [Abstract]
Service cost	0	1	1
Interest cost	24	26	33
Amortization of prior service cost	0	(2,888)	(4,206)
Actuarial net loss	1,548	2,092	2,548
Net periodic benefit cost	$ 1,572	$ (769)	$ (1,624)
Actuarial assumptions used to determine costs and benefit obligations related to postretirement plan [Abstract]
Discount rate	0.00%	0.55%	0.45%
Canadian Postretirement Benefit Plans [Member]
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	$ 110	$ 126
Service cost	0	0	$ 0
Interest cost	3	4	5
Benefits paid	(16)	(26)
Actuarial loss (gain)	(7)	17
Translation adjustment	(16)	(11)
Benefit obligation at end of year	74	110	126
(Unfunded) status of the plans	(74)	(110)
Amounts recognized in the balance sheet [Abstract]
Accrued postretirement benefit liabilities	74	110
Accumulated other comprehensive (income) loss (pre-tax) related to [Abstract]
Unrecognized net actuarial losses (gains)	(36)	(65)
Unrecognized prior service cost (credit)	(52)	(201)
Net Periodic benefit costs related to retirement plans [Abstract]
Service cost	0	0	0
Interest cost	3	4	5
Amortization of prior service cost	(112)	(129)	(140)
Actuarial net loss	(22)	(45)	(115)
Net periodic benefit cost	$ (131)	$ (170)	$ (250)
Actuarial assumptions used to determine costs and benefit obligations related to postretirement plan [Abstract]
Discount rate	3.00%	3.00%	3.50%
Current medical cost trend rate	5.71%	6.43%	7.14%
Ultimate medical cost trend rate	5.00%	5.00%	5.00%
Year trend rate declines to ultimate	2017	2017	2017

The amount of increase or decrease that results from foreign currency translation adjustments.

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Number of former union employees not covered under defined benefit plan.

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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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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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The amount of gains or losses recognized in net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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The interest rate used to adjust for the time value of money for the 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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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 total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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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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The ultimate trend rate for health care costs.

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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans.

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