Retirement Benefits (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Retirement Benefits [Abstract]
Number of unfunded non-qualified deferred compensation pension plans	2
Years of service credited under Supplemental Executive Retirement Plan (in years)	6 months
Defined benefit postretirement plans [Abstract]
Number of defined benefit postretirement plans	2
Number of defined postretirement plans providing medical benefits	1
Assumed submitted claims medical trend rate [used to fix the amount of the Company's obligation (in hundredths)]	9.25%
Year in which submitted claims medical trend rate was determined	1997
Defined contribution retirement plans [Abstract]
Employer contribution match rate, U.S. employees (in hundredths)	75.00%
Maximum employee contribution rate matched by employer, U.S. employees (in hundredths)	6.00%
Maximum employee contribution rate over and above employee contribution rate matched by employer, U.S. hourly employees (in hundredths)	18.00%
Incremental rate by which employee contribution rate may be increased or decreased, U.S. employees (in hundredths)	1.00%
Minimum employer contribution rate, Canadian employees (in hundredths)	3.00%
Maximum employer contribution rate, Canadian employees (in hundredths)	8.00%
Company's expense recorded for these plans	$ 11,300,000		$ 4,600,000	$ 3,800,000
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	214,981,000
Amounts recognized in accumulated other comprehensive income [Abstract]
Accumulated benefit obligation	301,100,000		268,300,000
Amounts that will be amortized from accumulated other comprehensive income into net periodic benefit cost in next fiscal year [Abstract]
Estimated net loss that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year	9,800,000		900,000
Estimated prior service cost that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year	100,000		300,000
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Discount rate, minimum (in hundredths)	4.09%
Historical compounded return period, minimum	10 years
Historical compounded return period, maximum	15 years
Accumulated other comprehensive income (loss) [Abstract]
Foreign currency translation, beginning of period	1,761,000		5,077,000
Foreign currency translation, current-period change	12,654,000		(3,316,000)	(960,000)
Foreign currency translation, end of period	14,415,000		1,761,000	5,077,000
Accumulated other comprehensive loss, beginning of period	(78,936,000)		(36,646,000)
Accumulated other comprehensive loss, current-period change	4,917,000		(42,290,000)
Accumulated other comprehensive loss, end of period	(74,019,000)		(78,936,000)	(36,646,000)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	92,184,000
Significant Observable Inputs (Level 2) [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	62,517,000
Significant Unobservable Inputs (Level 3) [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at beginning of year	59,090,000
Actual return on plan assets relating to assets still held at the reporting date	2,720,000
Actual return on plan assets relating to assets sold during the period	0
Purchases, sales, and settlements	1,560,000
Other	30,000
Transfers in and/or out of Level 3	0
Fair value of plan assets at end of year	60,280,000
Cash [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	7,678,000
Cash [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	7,678,000
Common stock [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	53,559,000
Common stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	53,559,000
International stock - commingled funds [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	32,683,000	[1]
International stock - commingled funds [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	32,683,000	[1]
International stock - mutual funds [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	18,787,000
International stock - mutual funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	18,787,000
US Treasuries [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	12,160,000
US Treasuries [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	12,160,000
Mortgage-backed securities [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	6,853,000
Mortgage-backed securities [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	6,853,000
Collateralized mortgage obligations [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	596,000
Collateralized mortgage obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at beginning of year	2,156,000
Purchases, sales, and settlements	(1,560,000)
Fair value of plan assets at end of year	596,000
Corporate bonds [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	22,981,000	[2]
Corporate bonds [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	22,981,000	[2]
Equity long/short hedge funds [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	37,010,000	[3]
Equity long/short hedge funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at beginning of year	35,288,000
Actual return on plan assets relating to assets still held at the reporting date	1,722,000
Fair value of plan assets at end of year	37,010,000	[3]
Insurance policy [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	675,000	[4]
Insurance policy [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at beginning of year	645,000
Other	30,000
Fair value of plan assets at end of year	675,000	[4]
Real Estate [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at end of year	21,999,000	[5]
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of plan assets [Roll Forward]
Fair value of plan assets at beginning of year	21,001,000
Actual return on plan assets relating to assets still held at the reporting date	998,000
Purchases, sales, and settlements	0
Fair value of plan assets at end of year	21,999,000	[5]
Pension Benefits [Member]
Benefit obligations [Roll Forward]
Benefit obligation at beginning of year	283,866,000		227,259,000
Service cost	10,209,000		6,881,000	5,654,000
Interest cost	12,147,000		11,842,000	11,585,000
Plan participants' contributions	0		0
Actuarial loss	32,547,000		48,250,000
Benefits paid	(11,220,000)		(10,333,000)
Plan change	0		0
Other	29,000		(33,000)
Benefit obligation at end of year	327,578,000		283,866,000	227,259,000
Fair value of plan assets [Roll Forward]
Fair value of plan assets at beginning of year	190,547,000		205,054,000
Actual return (loss) on plan assets	19,511,000		(4,595,000)
Employer contributions	16,131,000		441,000
Plan participants' contributions	0		0
Benefits paid	(11,220,000)		(10,333,000)
Other	12,000		(20,000)
Fair value of plan assets at end of year	214,981,000		190,547,000	205,054,000
Unfunded status at end of year	(112,597,000)		(93,319,000)
Amounts recognized in balance sheet [Abstract]
Other current accrued liabilities	(476,000)		(383,000)
Postretirement benefits	0		0
Pension benefits	(112,121,000)		(92,936,000)
Total amounts recognized in balance sheet	(112,597,000)		(93,319,000)
Amounts recognized in accumulated other comprehensive income [Abstract]
Prior service cost	2,661,000		3,247,000
Net loss (gain)	88,137,000		78,238,000
Total amounts recognized in accumulated other comprehensive income	90,798,000		81,485,000
Net periodic benefit cost [Abstract]
Service cost	10,209,000		6,881,000	5,654,000
Interest cost	12,147,000		11,842,000	11,585,000
Expected return on plan assets	(12,932,000)		(13,564,000)	(12,752,000)
Amortization of prior service cost	930,000		946,000	785,000
Amortization of net loss (gain)	9,769,000		3,917,000	3,712,000
Net periodic benefit cost	20,123,000		10,022,000	8,984,000
Weighted average assumptions used to determine benefit obligations [Abstract]
Discount rate, minimum (in hundredths)	3.58%		4.09%
Discount rate, maximum (in hundredths)	3.77%		4.19%
Rate of compensation increase (in hundredths)	4.80%		4.90%
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Discount rate, minimum (in hundredths)			5.19%	5.26%
Discount rate, maximum (in hundredths)	4.19%		5.26%	5.80%
Expected long-term return on plan assets (in hundredths)	6.80%		6.80%	6.80%
Rate of compensation increase (in hundredths)	4.80%		4.90%	5.12%
Estimated future employer contributions for the next fiscal year	400,000
Defined benefit plan, estimated future employer contributions in next fiscal year, minimum	10,000,000
Defined benefit plan, estimated future employer contributions in next fiscal year, maximum	15,000,000
Estimated future benefit payments [Abstract]
2013	12,687,000
2014	13,459,000
2015	14,323,000
2016	15,158,000
2017	16,129,000
2018 - 2022	92,957,000
Accumulated other comprehensive income (loss) [Abstract]
Defined benefit pension/postretirement plans, beginning of period	(81,813,000)		(43,372,000)
Defined benefit pension/postretirement, current-period change	(9,701,000)		(38,441,000)
Defined benefit pension/postretirement plans, end of period	(91,514,000)		(81,813,000)	(43,372,000)
Other postretirement Benefits [Member]
Benefit obligations [Roll Forward]
Benefit obligation at beginning of year	7,894,000		6,961,000
Service cost	176,000		129,000	92,000
Interest cost	311,000		347,000	350,000
Plan participants' contributions	516,000		646,000
Actuarial loss	182,000		673,000
Benefits paid	(860,000)		(862,000)
Plan change	(3,434,000)		0
Benefit obligation at end of year	4,785,000		7,894,000	6,961,000
Fair value of plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0		0
Actual return (loss) on plan assets	0		0
Employer contributions	343,000		216,000
Plan participants' contributions	516,000		646,000
Benefits paid	(860,000)		(862,000)
Other	0		0
Fair value of plan assets at end of year	0		0	0
Unfunded status at end of year	(4,785,000)		(7,894,000)
Amounts recognized in balance sheet [Abstract]
Other current accrued liabilities	(279,000)		(379,000)
Postretirement benefits	(4,506,000)		(7,515,000)
Pension benefits	0		0
Total amounts recognized in balance sheet	(4,785,000)		(7,894,000)
Amounts recognized in accumulated other comprehensive income [Abstract]
Prior service cost	(1,950,000)		245,000
Net loss (gain)	(1,089,000)		(1,320,000)
Total amounts recognized in accumulated other comprehensive income	(3,039,000)		(1,075,000)
Net periodic benefit cost [Abstract]
Service cost	176,000		129,000	92,000
Interest cost	311,000		347,000	350,000
Expected return on plan assets	0		0	0
Amortization of prior service cost	51,000		51,000	51,000
Amortization of net loss (gain)	(186,000)		(224,000)	(291,000)
Net periodic benefit cost	352,000		303,000	202,000
Weighted average assumptions used to determine benefit obligations [Abstract]
Discount rate (in hundredths)	3.75%		4.05%
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Discount rate (in hundredths)	4.05%		4.97%	5.58%
Estimated future employer contributions for the next fiscal year	200,000
Estimated future benefit payments [Abstract]
2013	249,000
2014	250,000
2015	251,000
2016	251,000
2017	253,000
2018 - 2022	1,267,000
Accumulated other comprehensive income (loss) [Abstract]
Defined benefit pension/postretirement plans, beginning of period	1,116,000		1,649,000
Defined benefit pension/postretirement, current-period change	1,964,000		(533,000)
Defined benefit pension/postretirement plans, end of period	$ 3,080,000		$ 1,116,000	$ 1,649,000

[1] This category represents International Equity Commingled Funds which invests in international stocks. The benchmark is the MSCI EAFE Index.

[2] This category represents investment grade bonds of U.S. issuers from diverse industries.

[3] This category includes hedge funds that invest both long and short in primarily U.S. common stocks. Managementof the hedge funds has the ability to shift investments from value to growth strategies, from small to large capitalization stocks, and from a net long position to a net short position; however it is expected that the equity long/short hedge funds will have a net long position.

[4] This category includes a private insurance policy used for French retirement benefits.

[5] This category includes a RREEF America II Fund and Black Rock Granite Properties which consists of commingled private real estate.