Employee Benefit Plans (Schedule of Components of the Change in Benefit Obligation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amounts recognized in statement of financial position
Noncurrent liabilities	$ (4,387)	$ (2,551)
Postretirement Medical Plan [Member]
Change in benefit obligation:
Benefit obligation at beginning of period	2,317	2,995	7,749
Service cost	24	32	146
Interest cost	118	126	399
Benefits paid	(40)	(77)	(93)
Change in plan provisions		(91)	(3,851)
Actuarial loss (gain)	558	(668)	(1,355)
Benefit obligation end of period	2,977	2,317	2,995
Change in plan assets
Fair value of plan assets at beginning of period
Actual return on plan assets
Employer contribution	40	77	93
Benefits paid	(40)	(77)	(93)
Fair value of plan assets at end of period
Funded status	(2,977)	(2,317)	(2,995)
Amounts recognized in statement of financial position
Non-current assets
Current liabilities	(83)	(89)	(132)
Noncurrent liabilities	(2,894)	(2,228)	(2,863)
Net amount recognized	(2,977)	(2,317)	(2,995)
Weighted average assumptions used:
Discount rate	4.30%	5.20%	4.30%
Rate of compensation increases
Postretirement Medical Plan [Member] \| Pre-65 [Member]
Assumed health care cost trend rates:
Health care cost trend rate assumed for next year	7.00%	7.75%	8.25%
Ultimate rate	4.50%	5.00%	5.00%
Year the ultimate rate is reached	2025	2022	2022
Postretirement Medical Plan [Member] \| Post-65 [Member]
Assumed health care cost trend rates:
Health care cost trend rate assumed for next year	20.00%	25.00%	35.00%
Ultimate rate	5.00%	5.00%	5.00%
Year the ultimate rate is reached	2022	2022	2022
Pension Plan [Member]
Change in benefit obligation:
Benefit obligation at beginning of period	15,873	17,272	15,134
Service cost
Interest cost	796	732	761
Benefits paid	(532)	(437)	(293)
Change in plan provisions		93
Actuarial loss (gain)	3,167	(1,787)	1,670
Benefit obligation end of period	19,304	15,873	17,272
Change in plan assets
Fair value of plan assets at beginning of period	16,652	12,543	10,842
Actual return on plan assets	1,307	3,857	1,488
Employer contribution	707	689	506
Benefits paid	(532)	(437)	(293)
Fair value of plan assets at end of period	18,134	16,652	12,543
Funded status	(1,170)	779	(4,729)
Accumulated benefit obligation	19,304	15,873	17,272
Amounts recognized in statement of financial position
Non-current assets		779
Current liabilities
Noncurrent liabilities	(1,170)		(4,729)
Net amount recognized	$ (1,170)	$ 779	$ (4,729)
Weighted average assumptions used:
Discount rate	4.20%	5.10%	4.30%
Rate of compensation increases

Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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Represents the ultimate trend rate, one for health care costs.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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

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Expected rate of compensation increases (for pay-related plans).

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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 assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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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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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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-Glossary Current Liabilities

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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