Pension Benefits (Details) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation Beginning of Year	$ 40,237,000	$ 29,480,000
Defined Benefit Plan, Service Cost	6,291,000	4,934,000	3,800,000
Defined Benefit Plan, Interest Cost	1,627,000	1,374,000	1,184,000
Defined Benefit Plan, Amendments	0	0
Defined Benefit Plan, Actuarial Loss	(1,577,000)	5,467,000
Defined Benefit Plan, Benefits Paid	(3,293,000)	(1,018,000)
Defined Benefit Plan, Benefit Obligation End of Year	43,285,000	40,237,000	29,480,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets Beginning of Year	20,254,000	13,940,000
Defined Benefit Plan, Actual Return on Plan Assets	2,726,000	1,952,000
Defined Benefit Plan, Employer Contribution	4,971,000	5,380,000	5,300,000
Defined Benefit Plan, Benefits Paid, Qualified Pension Plan	(3,293,000)	(1,018,000)	(1,500,000)
Defined Benefit Plan, Fair Value of Plan Assets End of Year	24,658,000	20,254,000	13,940,000
Defined Benefit Plan, Funded Status of Plan	(18,627,000)	(19,983,000)
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Defined Benefit Plan, Benefit Obligation End of Year	43,285,000	40,237,000	29,480,000
Defined Benefit Plan, Accumulated Benefit Obligation	32,396,000	29,437,000
Defined Benefit Plan, Fair Value of Plan Assets Beginning of Year	(24,658,000)	(20,254,000)	(13,940,000)
Defined Benefit Plan, Accumulated Unfunded Benefit Obligation	7,738,000	9,183,000
Pre-tax Amounts Recognized in Accumulated Other Comprehensive Income
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	8,439,000	12,427,000
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	136,000	153,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Transition Assets (Obligations), before Tax	0	0
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	8,575,000	12,580,000
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Defined Benefit Plan, Amounts Recognized In Other Comprehensive Income, Actuarial Losses, Before Tax	2,766,000	(4,680,000)	(3,014,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Arising During Period, before Tax	0	0	(170,000)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Benefit Cost, before Tax	(17,000)	(17,000)	0
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net (Gain) Loss Recognized in Net Periodic Benefit Cost, Net of Tax	(1,222,000)	(754,000)	(405,000)
Total Other Comprehensive Income (Loss)	4,005,000	(3,909,000)	(2,779,000)
Components of Net Periodic Benefit Costs for Both Pension Plans
Defined Benefit Plan, Service Cost	6,291,000	4,934,000	3,800,000
Defined Benefit Plan, Interest Cost	1,627,000	1,374,000	1,184,000
Defined Benefit Plan, Expected Return on Plan Assets	(1,538,000)	(1,165,000)	(880,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	17,000	17,000	0
Defined Benefit Plan, Amortization of Gains (Losses)	1,222,000	754,000	405,000
Defined Benefit Plan, Net Periodic Benefit Cost	7,619,000	5,914,000	4,509,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation and Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	5.00%	3.90%	4.70%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	6.20%	6.20%	6.20%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.90%	4.70%	5.30%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.50%	7.50%	7.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	6.20%	6.20%	6.20%
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	100.00%
Defined Benefit Plan, Asset Allocation	100.00%	100.00%
Future Benefit Payments
Defined Benefit Plan, Expected Future Benefit Payments in Year One	2,120,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	2,837,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	3,287,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	3,993,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	4,407,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	33,031,000
Defined Benefit Plan, Percent Vested After Two Years of Service	40.00%
Defined Benefit Plan, Years of Service Required for Initial Vesting	2
Defined Benefit Plan, Annual Vesting Increment	20.00%
Pension And Other Post-retirement Benefit Plans, Gain (Loss) Amortization Threshold	10.00%
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	436,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	4,300,000
Equity Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets Beginning of Year	8,660,000
Defined Benefit Plan, Fair Value of Plan Assets End of Year	10,744,000
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets Beginning of Year	(10,744,000)
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	44.00%
Defined Benefit Plan, Asset Allocation	43.60%	42.70%
Other than Securities Investment [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	23.00%
Defined Benefit Plan, Asset Allocation	24.20%	24.50%
Debt Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets Beginning of Year	6,630,000
Defined Benefit Plan, Fair Value of Plan Assets End of Year	7,937,000
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets Beginning of Year	$ (7,937,000)
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	33.00%
Defined Benefit Plan, Asset Allocation	32.20%	32.80%

Defined Benefit Plan, Accumulated Unfunded Benefit Obligation

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Defined Benefit Plan, Annual Vesting Increment

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Defined Benefit Plan, Benefits Paid, Qualified Pension Plan

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Defined Benefit Plan, Percent Vested After Two Years of Service

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Defined Benefit Plan, Years of Service Required for Initial Vesting

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Gain and loses in excess of 10% of the greater of the projected benefit obligation or fari value of plan assets will be amortized over the average remaining service period

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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 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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Before tax amount of net transition assets (obligations) which has yet to be recognized as a component of net periodic benefit cost.

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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) from a decision to temporarily deviate from the substantive plan, or from a change in benefit obligation or plan asset value from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover or salary scale.

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The amount of gains or losses recognized in net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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Before tax amount, net of reclassification adjustments, of the benefit improvement costs resulting from a plan amendment that occurred that has not been recognized in net periodic benefit cost.

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

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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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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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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