Qualified Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Qualified Employee Benefit Plans [Abstract]
Contributions to qualified profit sharing plan	$ 13,700,000	$ 14,600,000	$ 15,200,000
Defined contribution expense for foreign entities	7,700,000	7,100,000	7,700,000
Estimated future contributions, next fiscal year	5,900,000
Defined Benefit Plan, Amortization period of Transition Obligations (Assets) (in years)	26.3
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Interest cost on projected benefit obligations	4,627,000	4,600,000	4,419,000
Expected return on plan assets	(5,133,000)	(4,453,000)	(3,110,000)
Amortization of transition asset	(143,000)	(143,000)	(143,000)
Recognized actuarial loss	399,000	262,000	431,000
Net pension (benefit) charge	(250,000)	266,000	1,597,000
Change in projected benefit obligation: [Roll Forward]
Projected benefit obligation at beginning of year	87,733,000	77,164,000
Interest cost	4,627,000	4,600,000	4,419,000
Actuarial loss	4,585,000	9,634,000
Benefits paid	(2,290,000)	(3,665,000)
Projected benefit obligation at end of year	94,655,000	87,733,000	77,164,000
Change in plan assets: [Roll Forward]
Plan assets at fair value at beginning of year	64,627,000	56,592,000
Actual return on plan assets	(5,912,000)	5,600,000
Employer contribution	6,900,000	6,100,000
Benefits paid	(2,290,000)	(3,665,000)
Plan assets at fair value at end of year	63,325,000	64,627,000	56,592,000
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status	(31,330,000)	(23,106,000)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Unrecognized net gain (loss) from experience different from that assumed and effects of changes and assumptions, before tax	(15,231,000)	(8,225,000)
Unrecognized net plan assets as of January 1, 1987 being recognized over 26.3 years	(143,000)	(143,000)
Income	(15,374,000)	(8,368,000)
Income tax benefit	332,000	71,000
Other comprehensive (loss) income	(15,042,000)	(8,297,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), After Tax [Abstract]
Unrecognized net loss from experience different from that assumed and effects of changes and assumptions, before tax	(39,070,000)	(23,839,000)
Unrecognized net plan assets as of January 1, 1987 being recognized over 26.3 years	190,000	333,000
Income	(38,880,000)	(23,506,000)
Income tax benefit	849,000	517,000
Accumulated other comprehensive loss	(38,031,000)	(22,989,000)
Estimated initial plan assets expected to be amortized from AOCI in next fiscal year	143,017
Defined benefit plan, loss to be amortized over next fiscal year	865,624
Accumulated benefit obligation	94,700,000	87,700,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate (in hundredths)	5.10%	5.50%
Expected future benefit payments [Abstract]
2012	4,364,000
2013	3,969,000
2014	3,314,000
2015	5,072,000
2016	5,850,000
2017-2021	25,163,000
Assumptions used to determine net periodic benefit costs [Abstract]
Discount rate on benefit obligations (in hundredths)	5.50%	6.05%	6.20%
Expected long-term rate of return on plan assets (in hundredths)	8.00%	8.00%	8.00%
Retirement plan asset allocation [Abstract]
Equity securities (in hundredths)	62.00%	60.00%
Debt securities (in hundredths)	28.00%	32.00%
Real estate (in hundredths)	10.00%	8.00%
Total (in hundredths)	100.00%	100.00%
Allocation of retirement plan assets to global equity securities, minimum (in hundredths)	50.00%
Allocation of retirement plan assets to global equity securities, maximum (in hundredths)	70.00%
Allocation of retirement plan assets to global equity securities, target (in hundredths)	60.00%
Allocation of retirement plan assets to fixed income securities, minimum (in hundredths)	20.00%
Allocation of retirement plan assets to fixed income securities, maximum (in hundredths)	40.00%
Allocation of retirement plan assets to fixed income securities, target (in hundredths)	30.00%
Allocation of retirement plan assets to real estate investment trusts, minimum (in hundredths)	0.00%
Allocation of retirement plan assets to real estate investment trusts, maximum (in hundredths)	10.00%
Allocation of retirement plan assets to real estate investment trusts, target (in hundredths)	10.00%
Allocation of retirement plan assets to cash and cash equivalents, maximum (in hundredths)	5.00%
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	63,325,000	64,627,000	56,592,000
Percentage of mutual fund invested in Real Estate Investment Trusts (in hundredths)	80.00%
Postretirement medical benefits participation age, minimum (in years)	55
Postretirement medical benefits participation age, maximum (in years)	65
Percentage of cost of postretirement medical benefit premiums paid by participants (in hundredths)	100.00%
Postretirement medical benefit costs	800,000
Postretirement benefit obligation	6,700,000
Fair Value, Inputs, Level 1 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	33,896,000	5,408,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	33,896,000	5,408,000
Fair Value, Inputs, Level 2 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	29,429,000	59,219,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	29,429,000	59,219,000
Fair Value, Inputs, Level 3 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	0	0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	0	0
Cash [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	9,000	63,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	9,000	63,000
Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	9,000	63,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	9,000	63,000
Cash [Member] | Fair Value, Inputs, Level 2 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	0	0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	0	0
Cash [Member] | Fair Value, Inputs, Level 3 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	0	0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	0	0
US Treasury Bills [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	662,000	1,898,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	662,000	1,898,000
US Treasury Bills [Member] | Fair Value, Inputs, Level 1 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	0	0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	0	0
US Treasury Bills [Member] | Fair Value, Inputs, Level 2 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	662,000	1,898,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	662,000	1,898,000
US Treasury Bills [Member] | Fair Value, Inputs, Level 3 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	0	0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	0	0
US Government Agency Discount Notes [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	208,000	580,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	208,000	580,000
US Government Agency Discount Notes [Member] | Fair Value, Inputs, Level 1 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	0	0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	0	0
US Government Agency Discount Notes [Member] | Fair Value, Inputs, Level 2 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	208,000	580,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	208,000	580,000
US Government Agency Discount Notes [Member] | Fair Value, Inputs, Level 3 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	0	0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	0	0
Real Estate Funds [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	6,358,000	5,345,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	6,358,000	5,345,000
Real Estate Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	6,358,000	5,345,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	6,358,000	5,345,000
Real Estate Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	0	0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	0	0
Real Estate Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	0	0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	0	0
Fixed Income Mutual Funds [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	16,591,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	16,591,000
Fixed Income Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	16,591,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	16,591,000
Fixed Income Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	0
Fixed Income Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	0
Equity Mutual Funds [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	10,938,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	10,938,000
Equity Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	10,938,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	10,938,000
Equity Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	0
Equity Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	0
Private Investment Trusts Equity Securities [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	28,559,000	37,211,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	28,559,000	37,211,000
Private Investment Trusts Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	0	0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	0	0
Private Investment Trusts Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	28,559,000	37,211,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	28,559,000	37,211,000
Private Investment Trusts Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year	0	0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value	0	0
Offshore Hedge Funds Fixed/Equity Securities [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year		5,515,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value		5,515,000
Offshore Hedge Funds Fixed/Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year		0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value		0
Offshore Hedge Funds Fixed/Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year		5,515,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value		5,515,000
Offshore Hedge Funds Fixed/Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year		0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value		0
Private Investment Trusts Fixed Securities [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year		14,015,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value		14,015,000
Private Investment Trusts Fixed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year		0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value		0
Private Investment Trusts Fixed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year		14,015,000
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value		14,015,000
Private Investment Trusts Fixed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Change in plan assets: [Roll Forward]
Plan assets at fair value at end of year		0
Defined Benefit Plan Disclosure [Line Items]
Total assets measured at fair value		$ 0