Pension, Health Care and Postretirement Benefits Other Than Pensions (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Liabilities recognized in the Consolidated Balance Sheets:
Postretirement benefits other than pensions	$ (277,892)	$ (268,874)	$ (320,223)
Other accruals	(508,581)us-gaap_OtherLiabilitiesCurrent	(513,433)us-gaap_OtherLiabilitiesCurrent	(513,717)us-gaap_OtherLiabilitiesCurrent
Weighted-average assumptions used to determine benefit obligation:
Employer Group Waiver Plan (EGWP) trend rate (as a percentage)	8.00%
Postretirement Benefits Other than Pensions [Member]
Benefit obligation:
Balances at beginning of year	286,651	338,134	316,795
Service costs	2,434	3,061	2,943
Interest costs	12,782	12,183	13,520
Actuarial loss (gain)	27,757	(50,593)	18,961
Plan amendments	(19,043)	(2,503)
Benefits paid	(15,432)	(13,631)	(14,085)
Balances at end of year	295,149	286,651	338,134
Liabilities recognized in the Consolidated Balance Sheets:
Postretirement benefits other than pensions	(277,892)	(268,874)	(320,223)
Other accruals	(17,257)	(17,777)	(17,911)
Total	(295,149)	(286,651)	(338,134)
Amounts recognized in Cumulative other comprehensive loss:
Net actuarial losses	(36,044)	(8,287)	(62,814)
Prior service costs	21,043	2,503	328
Total recognized in Cumulative other comprehensive loss	$ (15,001)	$ (5,784)	$ (62,486)
Weighted-average assumptions used to determine benefit obligation:
Discount rate	3.90%	4.60%	3.70%
Health care cost trend rate - pre-65 (as a percentage)	7.00%	7.50%	8.00%
Health care cost trend rate - post-65 (as a percentage)	6.50%	6.50%	8.00%
Prescription drug cost increases (as a percentage)	6.50%	7.00%	8.00%
Weighted-average assumptions used to determine net periodic benefit cost:
Discount rate	4.60%	3.70%	4.40%
Health care cost trend rate - pre-65 (as a percentage)	7.50%	8.00%	8.00%
Health care cost trend rate - post-65 (as a percentage)	6.50%	8.00%	8.00%
Prescription drug cost increases (as a percentage)	7.00%	8.00%	8.00%

Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Employer Group Waiver Plan Trend Rate

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of 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) 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 interest rate used to adjust for the time value of money for the plan.

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The interest rate used to adjust for the time value of money.

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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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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 amount of increase or decrease due to a change in the terms of an existing 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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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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Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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This represents the noncurrent liability recognized in the balance sheet that is associated with other postretirement defined benefit plans (excluding pension plans).

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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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