Postretirement Medical Benefits (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Number of former union employees not covered under plan	64
Reduction in accumulated postretirement benefit obligation as result of modifications	$ 14,400,000
Discount rate assumptions used for remeasurement of costs and benefit obligation (in hundredths)	4.00%	4.55%	5.35%
Curtailment gain included within selling, general and administrative expenses	3,600,000
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	4,725,000	4,082,000	2,673,000
Service cost	130,000	111,000	79,000
Interest cost	186,000	181,000	133,000
Actuarial loss (gain)	327,000	1,117,000
Benefit obligation at end of year	4,725,000	4,082,000	2,673,000
Unfunded status of the plans	(4,725,000)	(4,082,000)
Amounts recognized in the balance sheet [Abstract]
Accrued postretirement benefit liabilities	4,725,000	4,082,000
Accumulated other comprehensive loss (pre-tax) related to [Abstract]
Unrecognized net actuarial losses (gains)	1,510,000	1,444,000
Unrecognized prior service cost (credit)	(28,000)	(138,000)
Estimated net loss expected to be amortized from accumulated other comprehensive income	2,400,000
Prior service cost (credit) expected to be amortized from accumulated other comprehensive income	(4,400,000)
Net Periodic benefit costs related to retirement plans [Abstract]
Service cost	130,000	111,000	79,000
Interest cost	186,000	181,000	133,000
Amortization of net actuarial loss	261,000	173,000	25,000
Amortization of prior service cost	110,000	111,000	110,000
Total net periodic benefit costs	687,000	576,000	347,000
Actuarial assumptions used to determine costs and benefit obligations related to postretirement plan [Abstract]
Discount rate (in hundredths)	4.00%	4.55%	5.35%
Summary of expected future benefit payments [Abstract]
2013	0
2014	0
2015	5,694,000
2016	0
2017	0
Years 2018 - 2022	0
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	1,000
Effect on total of service and interest cost components, 1-Percentage-Point Decrease	(1,000)
Effect on postretirement benefit obligation, 1-Percentage-Point Increase	37,000
Effect on postretirement benefit obligation, 1-Percentage-Point Decrease	(36,000)
Postretirement Benefits [Member]
Net Periodic benefit costs related to retirement plans [Abstract]
Total net periodic benefit costs	(1,969,000)	(7,329,000)	(6,293,000)
Summary of expected future benefit payments [Abstract]
2013	1,980,000
2014	1,187,000
2015	1,215,000
2016	1,268,000
2017	62,000
Years 2018 - 2022	198,000
U.S. Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate assumptions used for remeasurement of costs and benefit obligation (in hundredths)	0.55%	1.30%	5.35%	1.87%
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	5,950,000	6,955,000	22,169,000
Service cost	4,000	69,000	179,000
Interest cost	81,000	527,000	1,156,000
Benefits paid	(751,000)	(833,000)
Actuarial loss (gain)	(339,000)	(1,267,000)
Plan amendment	0	(13,710,000)
Translation adjustment	0	0
Benefit obligation at end of year	5,950,000	6,955,000	22,169,000
Unfunded status of the plans	(5,950,000)	(6,955,000)
Amounts recognized in the balance sheet [Abstract]
Accrued postretirement benefit liabilities	5,950,000	6,955,000
Accumulated other comprehensive loss (pre-tax) related to [Abstract]
Unrecognized net actuarial losses (gains)	7,809,000	11,035,000
Unrecognized prior service cost (credit)	(7,094,000)	(11,846,000)
Net Periodic benefit costs related to retirement plans [Abstract]
Service cost	4,000	69,000	179,000
Interest cost	81,000	527,000	1,156,000
Amortization of prior service cost	(4,752,000)	(6,433,000)	(9,012,000)
Amortization of unrecognized loss	2,887,000	2,246,000	1,348,000
Curtailment gain	0	(3,495,000)	0
Total net periodic benefit costs	(1,780,000)	(7,086,000)	(6,329,000)
Actuarial assumptions used to determine costs and benefit obligations related to postretirement plan [Abstract]
Discount rate (in hundredths)	0.55%	1.30%	5.35%	1.87%
Canadian Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate assumptions used for remeasurement of costs and benefit obligation (in hundredths)	3.00%	3.00%	5.00%	3.75%
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	156,000	192,000	774,000
Service cost	0	7,000	13,000
Interest cost	5,000	23,000	50,000
Benefits paid	(24,000)	(28,000)
Actuarial loss (gain)	(21,000)	131,000
Plan amendment	0	(705,000)
Translation adjustment	4,000	(10,000)
Benefit obligation at end of year	156,000	192,000	774,000
Unfunded status of the plans	(156,000)	(192,000)
Amounts recognized in the balance sheet [Abstract]
Accrued postretirement benefit liabilities	156,000	192,000
Accumulated other comprehensive loss (pre-tax) related to [Abstract]
Unrecognized net actuarial losses (gains)	(254,000)	(280,000)
Unrecognized prior service cost (credit)	(504,000)	(633,000)
Net Periodic benefit costs related to retirement plans [Abstract]
Service cost	0	7,000	13,000
Interest cost	5,000	23,000	50,000
Amortization of transition obligation	0	2,000	4,000
Amortization of net actuarial loss	(52,000)	(43,000)	(13,000)
Amortization of prior service cost	(142,000)	(80,000)	(18,000)
Curtailment gain	0	(152,000)	0
Total net periodic benefit costs	$ (189,000)	$ (243,000)	$ 36,000
Actuarial assumptions used to determine costs and benefit obligations related to postretirement plan [Abstract]
Discount rate (in hundredths)	3.00%	3.00%	5.00%	3.75%
Current medical cost trend rate (in hundredths)	8.57%	9.29%	10.00%
Ultimate medical cost trend rate (in hundredths)	5.00%	5.00%	5.00%
Year trend rate declines to ultimate	2017	2017	2017

The amount of losses unrecognized in net periodic benefit cost.

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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) from a decision to temporarily deviate from the substantive plan, or from a change in benefit obligation or plan asset value from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover or salary scale.

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The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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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 amount of the transition obligation or asset recognized in net periodic benefit cost.

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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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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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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 amount of increase or decrease in the accumulated benefit obligation related to the effects of a change in the substantive terms of an existing defined benefit pension 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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Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan.

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

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