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Employee Benefit Plans Fair Value Measurements (Details) (Pension Plans, Defined Benefit [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 320,699	$ 295,655	$ 302,464
Fair Value, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair Value	128,393	211,025
Fair Value, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	192,306	84,630
Equity Securities, Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	126,904	128,834
Equity Securities, Domestic [Member] \| Fair Value, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair Value	50,653	128,834
Equity Securities, Domestic [Member] \| Fair Value, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	76,251	0
Equity Securities, International [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	78,931	57,728
Equity Securities, International [Member] \| Fair Value, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair Value	51,758	57,728
Equity Securities, International [Member] \| Fair Value, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	27,173	0
Domestic Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	81,045	80,243
Domestic Debt Securities [Member] \| Fair Value, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair Value	0	0
Domestic Debt Securities [Member] \| Fair Value, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	81,045	80,243
Foreign Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	15,745	14,381
Foreign Debt Securities [Member] \| Fair Value, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair Value	15,745	14,381
Foreign Debt Securities [Member] \| Fair Value, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	0	0
Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	10,208	9,846
Real Estate Funds [Member] \| Fair Value, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair Value	10,208	9,846
Real Estate Funds [Member] \| Fair Value, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	0	0
Short-term Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	7,866	4,623
Short-term Investments [Member] \| Fair Value, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair Value	29	236
Short-term Investments [Member] \| Fair Value, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 7,837	$ 4,387

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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