Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 Fund		Dec. 31, 2012		Dec. 31, 2011
Increase/(Decrease) in AOCI [Abstract]
Other adjustments	$ (68,038,000)		$ 1,221,000		$ 19,789,000
Information used in actuarial assumptions [Abstract]
Minimum value of outstanding noncallable bonds used in hypothetical cash flow bond matching exercise	50,000,000
Future earnings period used in determining the expected average rate of earnings (in years)	20 years
Target Allocation of Assets [Abstract]
Maximum investment in international oriented funds (in hundredths)	30.00%
Number of international mutual funds	2
Percent of international oriented funds equity allocation in emerging markets (in hundredths)	4.00%
Percent of international oriented funds equity allocation in companies based outside of the United States, primarily Europe and the Pacific Basin (in hundredths)	23.00%
Effect of 1% change in the health care trend rate assumption [Abstract]
Effect of 1-percentage point increase on total service and interest cost component	301,000
Effect of 1-percentage point increase on postretirement benefit obligation	2,525,000
Effect of 1-percentage point decrease on total service and interest cost components	(233,000)
Effect of 1-percentage point decrease on postretirement benefit obligation	(1,971,000)
Profit sharing and 401(k) savings plan [Abstract]
Discretionary profit sharing contribution as a percentage of participant's eligible compensation (in hundredths)	5.00%
Matching contribution rate on employees' before-tax contributions, first contribution level (in hundredths)	80.00%
Employee contributions subject to employer match, first contribution level	1,000
Matching contribution rate on employees' before-tax contributions, second contribution level (in hundredths)	40.00%
Employee contributions subject to employer match, second contribution level	2,000
Profit sharing and 401(k) savings plan expenses	5,300,000		3,100,000		3,600,000
Pension and Supplemental Executive Retirement Plans [Member]
Components of Net Periodic Benefit Cost [Abstract]
Company Service Cost	11,338,000		9,662,000		8,917,000
Interest Cost	15,289,000		16,481,000		16,098,000
Expected Return on Assets	(20,144,000)		(18,211,000)		(17,373,000)
Other Adjustments	0		0		0
Subtotal	6,483,000		7,932,000		7,642,000
Amortization of Net Transition Obligation/(Asset)	0		0		0
Amortization of Net Prior Service Cost/(Credit)	503,000		665,000		661,000
Amortization of Net Losses/(Gains)	6,145,000		5,829,000		4,010,000
Total Amortization	6,648,000		6,494,000		4,671,000
Net Periodic Benefit Cost	13,131,000		14,426,000		12,313,000
Cost of settlements or curtailments	0		0		0
Total Expense for Year	13,131,000		14,426,000		12,313,000
Actuarial Value of Benefit Obligations [Abstract]
Measurement Date	12/31/2013		12/31/2012
Accumulated Benefit Obligation	304,825,000		331,985,000
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Projected Benefit Obligation	(317,606,000)		(362,657,000)		(318,048,000)
Plan Assets at Fair Value	355,704,000		340,335,000		305,748,000
Funded Status - Overfunded/(Underfunded)	38,098,000		(22,322,000)
Accumulated Other Comprehensive Income [Abstract]
Net Actuarial (Gain)/Loss	49,925,000		106,661,000
Net Prior Service Cost/(Credit)	(4,782,000)		1,775,000
Net Transition Obligation/(Asset)	0		0
Total at Year End	45,143,000		108,436,000		97,576,000
Change in Projected Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	362,657,000		318,048,000
Company Service Cost	11,338,000		9,662,000		8,917,000
Interest Cost	15,289,000		16,481,000		16,098,000
Plan Participants' Contributions	0		0
Net Actuarial (Gain)/Loss due to Assumption Changes	(44,205,000)		37,418,000
Net Actuarial (Gain)/Loss due to Plan Experience	1,353,000		634,000
Benefit Payments from Fund	(22,497,000)	[1]	(19,483,000)	[1]
Benefit Payments Directly by Company	(275,000)		(265,000)
Plan Amendments	(6,054,000)		162,000
Other Adjustment	0		0
Benefit Obligation at End of Year	317,606,000		362,657,000		318,048,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	340,335,000		305,748,000
Company Contributions	10,275,000		15,265,000
Plan Participants' Contributions	0		0
Benefit Payments from Fund	(22,497,000)	[1]	(19,483,000)	[1]
Benefit Payments Directly by Company	(275,000)		(265,000)
Actual Return on Assets	27,866,000		39,070,000
Other Adjustment	0		0
Fair Value of Plan Assets at End of Year	355,704,000		340,335,000		305,748,000
Change in Accumulated Other Comprehensive Income (AOCI) [Abstract]
AOCI in Prior Year	108,436,000		97,576,000
Increase/(Decrease) in AOCI [Abstract]
Recognized during year - Prior Service (Cost)/Credit	(503,000)		(665,000)
Recognized during year - Net Actuarial (Losses)/Gains	(6,145,000)		(5,829,000)
Occurring during year - Prior Service Cost	(6,054,000)		162,000
Occurring during year - Net Actuarial Losses/(Gains)	(50,574,000)		17,192,000
Other adjustments	(17,000)		0
AOCI in Current Year	45,143,000		108,436,000		97,576,000
Amortizations Expected to be Recognized During Next Fiscal Year Ending [Abstract]
Amortization of Net Transition Obligation/(Asset)	0
Amortization of Prior Service Cost/(Credit)	(169,000)
Amortization of Net Losses/(Gains)	1,164,000
Weighted-Average Assumptions Used to Determine Benefit Obligations at year end [Abstract]
Discount Rate (in hundredths)	5.15%		4.25%
Rate of Compensation Increase (in hundredths)	3.00%		3.00%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Year [Abstract]
Discount Rate (in hundredths)	4.25%		5.25%
Expected Long-term Return on Plan Assets (in hundredths)	6.00%		6.00%
Rate of Compensation Increase (in hundredths)	3.00%		3.00%
Assets at Fair Value [Abstract]
Total Assets at fair value	355,704,000		340,335,000		305,748,000
Company Contributions [Abstract]
Current	10,275,000		15,265,000
Current + 1	2,158,000
Actual Benefit Payments [Abstract]
Current	22,773,000
Expected Benefit Payments [Abstract]
Current + 1	12,538,000
Current + 2	13,240,000
Current + 3	13,743,000
Current + 4	14,872,000
Current + 5	16,105,000
Current + 6 - 10	99,395,000
Other Postretirement Benefits [Member]
Components of Net Periodic Benefit Cost [Abstract]
Company Service Cost	812,000		1,226,000		1,090,000
Interest Cost	618,000		1,144,000		1,350,000
Expected Return on Assets	(3,679,000)		(3,162,000)		(3,299,000)
Other Adjustments	0		0		0
Subtotal	(2,249,000)		(792,000)		(859,000)
Amortization of Net Transition Obligation/(Asset)	0		0		0
Amortization of Net Prior Service Cost/(Credit)	(6,649,000)		(6,217,000)		(6,217,000)
Amortization of Net Losses/(Gains)	0		797,000		632,000
Total Amortization	(6,649,000)		(5,420,000)		(5,585,000)
Net Periodic Benefit Cost	(8,898,000)		(6,212,000)		(6,445,000)
Cost of settlements or curtailments	0		0		0
Total Expense for Year	(8,898,000)		(6,212,000)		(6,445,000)
Actuarial Value of Benefit Obligations [Abstract]
Measurement Date	12/31/2013		12/31/2012
Accumulated Benefit Obligation	15,764,000		16,284,000
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Projected Benefit Obligation	(15,764,000)		(16,284,000)		(25,007,000)
Plan Assets at Fair Value	62,298,000		49,391,000		42,578,000
Funded Status - Overfunded/(Underfunded)	46,534,000		33,107,000
Accumulated Other Comprehensive Income [Abstract]
Net Actuarial (Gain)/Loss	(9,439,000)		1,985,000
Net Prior Service Cost/(Credit)	(31,938,000)		(38,587,000)
Net Transition Obligation/(Asset)	0		0
Total at Year End	(41,377,000)		(36,602,000)		(26,964,000)
Change in Projected Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	16,284,000		25,007,000
Company Service Cost	812,000		1,226,000		1,090,000
Interest Cost	618,000		1,144,000		1,350,000
Plan Participants' Contributions	299,000		356,000
Net Actuarial (Gain)/Loss due to Assumption Changes	(1,414,000)		(6,517,000)
Net Actuarial (Gain)/Loss due to Plan Experience	101,000		(497,000)
Benefit Payments from Fund	(871,000)	[1]	(661,000)	[1]
Benefit Payments Directly by Company	(65,000)		(42,000)
Plan Amendments	0		(3,732,000)
Other Adjustment	0		0
Benefit Obligation at End of Year	15,764,000		16,284,000		25,007,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	49,391,000		42,578,000
Company Contributions	0		0
Plan Participants' Contributions	299,000		356,000
Benefit Payments from Fund	(871,000)	[1]	(661,000)	[1]
Benefit Payments Directly by Company	(65,000)		(42,000)
Actual Return on Assets	13,778,000		7,474,000
Other Adjustment	(234,000)		(314,000)
Fair Value of Plan Assets at End of Year	62,298,000		49,391,000		42,578,000
Change in Accumulated Other Comprehensive Income (AOCI) [Abstract]
AOCI in Prior Year	(36,602,000)		(26,964,000)
Increase/(Decrease) in AOCI [Abstract]
Recognized during year - Prior Service (Cost)/Credit	6,649,000		6,217,000
Recognized during year - Net Actuarial (Losses)/Gains	0		(797,000)
Occurring during year - Prior Service Cost	0		(3,732,000)
Occurring during year - Net Actuarial Losses/(Gains)	(11,411,000)		(11,326,000)
Other adjustments	(13,000)		0
AOCI in Current Year	(41,377,000)		(36,602,000)		(26,964,000)
Amortizations Expected to be Recognized During Next Fiscal Year Ending [Abstract]
Amortization of Net Transition Obligation/(Asset)	0
Amortization of Prior Service Cost/(Credit)	(6,649,000)
Amortization of Net Losses/(Gains)	(292,000)
Weighted-Average Assumptions Used to Determine Benefit Obligations at year end [Abstract]
Discount Rate (in hundredths)	4.75%		3.85%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Year [Abstract]
Discount Rate (in hundredths)	3.85%		4.75%
Expected Long-term Return on Plan Assets (in hundredths)	7.50%		7.50%
Assumed Health Care Cost Trend Rates at year end [Abstract]
Health Care Cost Trend Rate Assumed for Next Year (in hundredths)	7.00%		7.50%
Rate to Which the Cost Trend Rate is Assumed to Decline (Ultimate Trend Rate) (in hundredths)	5.00%		5.00%
Year That the Rate Reaches the Ultimate Trend Rate	2018		2018
Allocation of assets at year end [Abstract]
Weighted-average asset allocations of plans (in hundredths)	100.00%		100.00%
Assets at Fair Value [Abstract]
Total Assets at fair value	62,298,000		49,391,000		42,578,000
Target Allocation of Assets [Abstract]
Minimum period for which plan portfolio returns are expected to achieve stated objectives	5 years
Company Contributions [Abstract]
Current	0		0
Current + 1	0
Actual Benefit Payments [Abstract]
Current	638,000
Expected Benefit Payments [Abstract]
Current + 1	793,000
Current + 2	832,000
Current + 3	870,000
Current + 4	942,000
Current + 5	1,160,000
Current + 6 - 10	7,558,000
Health care trend rate used for pre-65 benefits (in hundredths)	7.50%
Age of retirees at which retirement benefits under the plan are terminated (in years)	65 years
Health care trend rate used for pre-65 benefits in 2014 (in hundredths)	7.00%
Health care trend rate used for pre-65 benefits in 2018 (in hundredths)	5.00%
Other Postretirement Benefits [Member] | Domestic Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	45,585,000		34,720,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	45,585,000		34,720,000
Assets at Fair Value [Abstract]
Total Assets at fair value	45,585,000		34,720,000
Other Postretirement Benefits [Member] | International Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	16,713,000		14,671,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	16,713,000		14,671,000
Assets at Fair Value [Abstract]
Total Assets at fair value	16,713,000		14,671,000
Other Postretirement Benefits [Member] | Debt Securities [Member]
Allocation of assets at year end [Abstract]
Weighted-average asset allocations of plans (in hundredths)	0.00%		0.00%
Other Postretirement Benefits [Member] | Equity Securities [Member]
Allocation of assets at year end [Abstract]
Weighted-average asset allocations of plans (in hundredths)	100.00%		100.00%
Target Allocation of Assets [Abstract]
Target asset allocations, minimum (in hundredths)	90.00%
Target asset allocations, maximum (in hundredths)	100.00%
Other Postretirement Benefits [Member] | Fixed Income [Member]
Target Allocation of Assets [Abstract]
Target asset allocations, minimum (in hundredths)	0.00%
Target asset allocations, maximum (in hundredths)	10.00%
Other Postretirement Benefits [Member] | Other [Member]
Allocation of assets at year end [Abstract]
Weighted-average asset allocations of plans (in hundredths)	0.00%		0.00%
Other Postretirement Benefits [Member] | Level 1 [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	62,298,000		49,391,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	62,298,000		49,391,000
Assets at Fair Value [Abstract]
Total Assets at fair value	62,298,000		49,391,000
Other Postretirement Benefits [Member] | Level 1 [Member] | Domestic Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	45,585,000		34,720,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	45,585,000		34,720,000
Assets at Fair Value [Abstract]
Total Assets at fair value	45,585,000		34,720,000
Other Postretirement Benefits [Member] | Level 1 [Member] | International Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	16,713,000		14,671,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	16,713,000		14,671,000
Assets at Fair Value [Abstract]
Total Assets at fair value	16,713,000		14,671,000
Other Postretirement Benefits [Member] | Level 2 [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Other Postretirement Benefits [Member] | Level 2 [Member] | Domestic Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Other Postretirement Benefits [Member] | Level 2 [Member] | International Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Other Postretirement Benefits [Member] | Level 3 [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Other Postretirement Benefits [Member] | Level 3 [Member] | Domestic Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Other Postretirement Benefits [Member] | Level 3 [Member] | International Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	355,704,000		340,335,000
Change in Projected Benefit Obligation [Roll Forward]
Lump sum pension plan benefit payments	13,800,000		12,000,000
Maximum amount of eligible participant vested benefits for which lump sum payment can be elected	200,000		100,000
Maximum amount of eligible participant vested benefits for which lump sum payment can be elected next year	500,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	340,335,000
Fair Value of Plan Assets at End of Year	355,704,000		340,335,000
Allocation of assets at year end [Abstract]
Weighted-average asset allocations of plans (in hundredths)	100.00%		100.00%
Assets at Fair Value [Abstract]
Total Assets at fair value	355,704,000		340,335,000
Target Allocation of Assets [Abstract]
Minimum period for which plan portfolio returns are expected to achieve stated objectives	5 years
Pension Plan [Member] | Domestic Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	51,240,000		45,071,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	51,240,000		45,071,000
Assets at Fair Value [Abstract]
Total Assets at fair value	51,240,000		45,071,000
Pension Plan [Member] | Common Stocks [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	60,332,000		54,210,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	60,332,000		54,210,000
Assets at Fair Value [Abstract]
Total Assets at fair value	60,332,000		54,210,000
Pension Plan [Member] | Corporate Bond [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	134,012,000		130,643,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	134,012,000		130,643,000
Assets at Fair Value [Abstract]
Total Assets at fair value	134,012,000		130,643,000
Pension Plan [Member] | U.S. Government Securities [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	18,819,000		25,859,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	18,819,000		25,859,000
Assets at Fair Value [Abstract]
Total Assets at fair value	18,819,000		25,859,000
Pension Plan [Member] | Municipals [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	33,402,000		26,595,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	33,402,000		26,595,000
Assets at Fair Value [Abstract]
Total Assets at fair value	33,402,000		26,595,000
Pension Plan [Member] | Foreign Bonds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	15,961,000		17,710,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	15,961,000		17,710,000
Assets at Fair Value [Abstract]
Total Assets at fair value	15,961,000		17,710,000
Pension Plan [Member] | Foreign Stocks [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	2,124,000		768,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	2,124,000		768,000
Assets at Fair Value [Abstract]
Total Assets at fair value	2,124,000		768,000
Pension Plan [Member] | International Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	39,814,000		39,479,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	39,814,000		39,479,000
Assets at Fair Value [Abstract]
Total Assets at fair value	39,814,000		39,479,000
Pension Plan [Member] | Debt Securities [Member]
Allocation of assets at year end [Abstract]
Weighted-average asset allocations of plans (in hundredths)	57.00%		60.00%
Pension Plan [Member] | Equity Securities [Member]
Allocation of assets at year end [Abstract]
Weighted-average asset allocations of plans (in hundredths)	43.00%		40.00%
Target Allocation of Assets [Abstract]
Target asset allocations, minimum (in hundredths)	0.00%
Target asset allocations, maximum (in hundredths)	60.00%
Pension Plan [Member] | Fixed Income [Member]
Target Allocation of Assets [Abstract]
Target asset allocations, minimum (in hundredths)	40.00%
Target asset allocations, maximum (in hundredths)	100.00%
Pension Plan [Member] | Other [Member]
Allocation of assets at year end [Abstract]
Weighted-average asset allocations of plans (in hundredths)	0.00%		0.00%
Pension Plan [Member] | Cash Equivalents [Member]
Target Allocation of Assets [Abstract]
Target asset allocations, minimum (in hundredths)	0.00%
Target asset allocations, maximum (in hundredths)	10.00%
Pension Plan [Member] | Level 1 [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	172,329,000		165,387,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	172,329,000		165,387,000
Assets at Fair Value [Abstract]
Total Assets at fair value	172,329,000		165,387,000
Pension Plan [Member] | Level 1 [Member] | Domestic Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	51,240,000		45,071,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	51,240,000		45,071,000
Assets at Fair Value [Abstract]
Total Assets at fair value	51,240,000		45,071,000
Pension Plan [Member] | Level 1 [Member] | Common Stocks [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	60,332,000		54,210,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	60,332,000		54,210,000
Assets at Fair Value [Abstract]
Total Assets at fair value	60,332,000		54,210,000
Pension Plan [Member] | Level 1 [Member] | Corporate Bond [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 1 [Member] | U.S. Government Securities [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	18,819,000		25,859,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	18,819,000		25,859,000
Assets at Fair Value [Abstract]
Total Assets at fair value	18,819,000		25,859,000
Pension Plan [Member] | Level 1 [Member] | Municipals [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 1 [Member] | Foreign Bonds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 1 [Member] | Foreign Stocks [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	2,124,000		768,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	2,124,000		768,000
Assets at Fair Value [Abstract]
Total Assets at fair value	2,124,000		768,000
Pension Plan [Member] | Level 1 [Member] | International Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	39,814,000		39,479,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	39,814,000		39,479,000
Assets at Fair Value [Abstract]
Total Assets at fair value	39,814,000		39,479,000
Pension Plan [Member] | Level 2 [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	183,375,000		174,948,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	183,375,000		174,948,000
Assets at Fair Value [Abstract]
Total Assets at fair value	183,375,000		174,948,000
Pension Plan [Member] | Level 2 [Member] | Domestic Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 2 [Member] | Common Stocks [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 2 [Member] | Corporate Bond [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	134,012,000		130,643,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	134,012,000		130,643,000
Assets at Fair Value [Abstract]
Total Assets at fair value	134,012,000		130,643,000
Pension Plan [Member] | Level 2 [Member] | U.S. Government Securities [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 2 [Member] | Municipals [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	33,402,000		26,595,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	33,402,000		26,595,000
Assets at Fair Value [Abstract]
Total Assets at fair value	33,402,000		26,595,000
Pension Plan [Member] | Level 2 [Member] | Foreign Bonds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	15,961,000		17,710,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	15,961,000		17,710,000
Assets at Fair Value [Abstract]
Total Assets at fair value	15,961,000		17,710,000
Pension Plan [Member] | Level 2 [Member] | Foreign Stocks [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 2 [Member] | International Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 3 [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 3 [Member] | Domestic Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 3 [Member] | Common Stocks [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 3 [Member] | Corporate Bond [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 3 [Member] | U.S. Government Securities [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 3 [Member] | Municipals [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 3 [Member] | Foreign Bonds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 3 [Member] | Foreign Stocks [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	0		0
Pension Plan [Member] | Level 3 [Member] | International Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0		0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0		0
Assets at Fair Value [Abstract]
Total Assets at fair value	$ 0		$ 0

[1] In 2013, includes lump sum payments of $13.8 million from our pension plan to eligible participants, which were former employees with vested benefits of $200 thousand or less. In 2014, former employees with vested benefits of $500 thousand or less may elect this option. In 2012, includes lump sum payments of $12.0 million from our pension plan to eligible participants, which were former employees with vested benefits of $100 thousand or less.