Retirement Plans Pension and Postretirement Plans Table (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year	$ 282,000
Employer Contributions	21,000	28,000
Fair value of plan assets at end of year	303,496	282,000
Pension Plans, Defined Benefit [Member]
Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year	282,000	224,426
Actual return on plan assets	15,255	42,400
Employer Contributions	21,000	28,000
Gross benefits paid	(14,759)	(12,826)
Fair value of plan assets at end of year	303,496	282,000	224,426
Change in Benefit Obligation
Net benefit obligation at beginning of year	154,624	159,748
Service cost	11,058	12,078	10,287
Interest cost	7,132	6,237	6,547
Curtailments, Settlements, Special Termination Benefits	0	0
Actuarial gain (loss)	13,278	(10,613)
Gross benefits paid	(14,759)	(12,826)
Net benefit obligation at end of year	171,333	154,624	159,748
Funded (unfunded) status	132,163	127,376
Noncurrent assets	132,163	127,376
Current liabilities	0	0
Noncurrent liabilities	0	0
Asset (Liability) Recognized in the Consolidated Balance Sheet	132,163	127,376
Other Postretirement Benefit Plans, Defined Benefit [Member]
Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer Contributions	343	351
Gross benefits paid	(343)	(351)
Fair value of plan assets at end of year	0	0	0
Change in Benefit Obligation
Net benefit obligation at beginning of year	3,288	3,935
Service cost	0	0
Interest cost	150	142	182
Curtailments, Settlements, Special Termination Benefits	0	0
Actuarial gain (loss)	483	(438)
Gross benefits paid	(343)	(351)
Net benefit obligation at end of year	3,578	3,288	3,935
Funded (unfunded) status	(3,578)	(3,288)
Noncurrent assets	0	0
Current liabilities	(330)	(343)
Noncurrent liabilities	(3,248)	(2,945)
Asset (Liability) Recognized in the Consolidated Balance Sheet	$ (3,578)	$ (3,288)

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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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 aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit 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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The increase in the fair value of plan assets from contributions made by the employer.

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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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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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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 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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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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