Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 Fund		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income [Abstract]
Minimum percentages of gain loss consider for amortization (in hundredths)	10.00%
Increase/(Decrease) in AOCI [Abstract]
Other adjustments	$ 52,112,000		$ (68,038,000)		$ 1,221,000
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	20 years
Target Allocation of Assets [Abstract]
Minimum percentage return should exceed growth in consumer price index annually (in hundredths)	5.75%
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)	21.00%
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	259,000
Effect of 1-percentage point increase on postretirement benefit obligation	2,963,000
Effect of 1-percentage point decrease on total service and interest cost components	(201,000)
Effect of 1-percentage point decrease on postretirement benefit obligation	(2,466,000)
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	5,000,000		5,300,000		3,100,000
Employee contributions subject to employer match for employees hired after 01/01/2014 (in hundredths)	4.00%
Matching contribution rate on employees' before-tax contributions, hired after 01/01/2014 (in hundredths)	100.00%
Pension and Supplemental Executive Retirement Plans [Member]
Components of Net Periodic Benefit Cost [Abstract]
Company Service Cost	8,565,000		11,338,000		9,662,000
Interest Cost	15,987,000		15,289,000		16,481,000
Expected Return on Assets	(21,030,000)		(20,144,000)		(18,211,000)
Other Adjustments	0		0		0
Subtotal	3,522,000		6,483,000		7,932,000
Amortization of Net Transition Obligation/(Asset)	0		0		0
Amortization of Net Prior Service Cost/(Credit)	(930,000)		503,000		665,000
Amortization of Net Losses/(Gains)	1,083,000		6,145,000		5,829,000
Total Amortization	153,000		6,648,000		6,494,000
Net Periodic Benefit Cost	3,675,000		13,131,000		14,426,000
Cost of settlements or curtailments	302,000		0		0
Total Expense for Year	3,977,000		13,131,000		14,426,000
Actuarial Value of Benefit Obligations [Abstract]
Measurement Date	12/31/2014		12/31/2013
Accumulated Benefit Obligation	366,440,000		304,825,000
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Projected Benefit Obligation	(379,324,000)		(317,606,000)		(362,657,000)
Plan Assets at Fair Value	378,701,000		355,704,000		340,335,000
Funded Status - Overfunded/(Underfunded)	(623,000)		38,098,000
Accumulated Other Comprehensive Income [Abstract]
Net Actuarial (Gain)/Loss	93,243,000		49,925,000
Net Prior Service Cost/(Credit)	(3,853,000)		(4,782,000)
Net Transition Obligation/(Asset)	0		0
Total at Year End	89,390,000		45,143,000		108,436,000
Change in Projected Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	317,606,000		362,657,000
Company Service Cost	8,565,000		11,338,000		9,662,000
Interest Cost	15,987,000		15,289,000		16,481,000
Plan Participants' Contributions	0		0
Net Actuarial (Gain)/Loss due to Assumption Changes	59,901,000		(44,205,000)
Net Actuarial (Gain)/Loss due to Plan Experience	(55,000)		1,353,000
Benefit Payments from Fund	(21,539,000)	[1]	(22,497,000)	[1]
Benefit Payments Directly by Company	(1,404,000)		(275,000)
Plan Amendments	(1,000)		(6,054,000)
Other Adjustment	264,000		0
Benefit Obligation at End of Year	379,324,000		317,606,000		362,657,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	355,704,000		340,335,000
Company Contributions	9,504,000		10,275,000
Plan Participants' Contributions	0		0
Benefit Payments from Fund	(21,539,000)	[1]	(22,497,000)	[1]
Benefit Payments Directly by Company	(1,404,000)		(275,000)
Actual Return on Assets	36,436,000		27,866,000
Other Adjustment	0		0
Fair Value of Plan Assets at End of Year	378,701,000		355,704,000		340,335,000
Change in Accumulated Other Comprehensive Income (AOCI) [Abstract]
AOCI in Prior Year	45,143,000		108,436,000
Increase/(Decrease) in AOCI [Abstract]
Recognized during year - Prior Service (Cost)/Credit	930,000		(503,000)
Recognized during year - Net Actuarial (Losses)/Gains	(1,083,000)		(6,145,000)
Occurring during year - Prior Service Cost	(1,000)		(6,054,000)
Occurring during year - Net Actuarial Losses/(Gains)	44,703,000		(50,574,000)
Occurring during year - Net Settlement Losses/(Gains)	(302,000)		0
Other adjustments	0		(17,000)
AOCI in Current Year	89,390,000		45,143,000		108,436,000
Amortizations Expected to be Recognized During Next Fiscal Year Ending [Abstract]
Amortization of Net Transition Obligation/(Asset)	0
Amortization of Prior Service Cost/(Credit)	(846,000)
Amortization of Net Losses/(Gains)	4,837,000
Weighted-Average Assumptions Used to Determine Benefit Obligations at year end [Abstract]
Discount Rate (in hundredths)	4.25%		5.15%
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)	5.15%		4.25%
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	378,701,000		355,704,000		340,335,000
Company Contributions [Abstract]
Current	9,504,000		10,275,000
Current + 1	17,000,000
Actual Benefit Payments [Abstract]
Current	22,942,000
Expected Benefit Payments [Abstract]
Current + 1	22,966,000
Current + 2	23,159,000
Current + 3	24,356,000
Current + 4	25,683,000
Current + 5	27,217,000
Current + 6 - 10	135,585,000
Other Postretirement Benefits [Member]
Components of Net Periodic Benefit Cost [Abstract]
Company Service Cost	659,000		812,000		1,226,000
Interest Cost	653,000		618,000		1,144,000
Expected Return on Assets	(4,648,000)		(3,679,000)		(3,162,000)
Other Adjustments	0		0		0
Subtotal	(3,336,000)		(2,249,000)		(792,000)
Amortization of Net Transition Obligation/(Asset)	0		0		0
Amortization of Net Prior Service Cost/(Credit)	(6,649,000)		(6,649,000)		(6,217,000)
Amortization of Net Losses/(Gains)	(435,000)		0		797,000
Total Amortization	(7,084,000)		(6,649,000)		(5,420,000)
Net Periodic Benefit Cost	(10,420,000)		(8,898,000)		(6,212,000)
Cost of settlements or curtailments	0		0		0
Total Expense for Year	(10,420,000)		(8,898,000)		(6,212,000)
Actuarial Value of Benefit Obligations [Abstract]
Measurement Date	12/31/2014		12/31/2013
Accumulated Benefit Obligation	18,225,000		15,764,000
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Projected Benefit Obligation	(18,225,000)		(15,764,000)		(16,284,000)
Plan Assets at Fair Value	66,940,000		62,298,000		49,391,000
Funded Status - Overfunded/(Underfunded)	48,715,000		46,534,000
Accumulated Other Comprehensive Income [Abstract]
Net Actuarial (Gain)/Loss	(8,222,000)		(9,439,000)
Net Prior Service Cost/(Credit)	(25,289,000)		(31,938,000)
Net Transition Obligation/(Asset)	0		0
Total at Year End	(33,511,000)		(41,377,000)		(36,602,000)
Change in Projected Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	15,764,000		16,284,000
Company Service Cost	659,000		812,000		1,226,000
Interest Cost	653,000		618,000		1,144,000
Plan Participants' Contributions	336,000		299,000
Net Actuarial (Gain)/Loss due to Assumption Changes	2,276,000		(1,414,000)
Net Actuarial (Gain)/Loss due to Plan Experience	(855,000)		101,000
Benefit Payments from Fund	(645,000)	[1]	(871,000)	[1]
Benefit Payments Directly by Company	0		(65,000)
Plan Amendments	0		0
Other Adjustment	37,000		0
Benefit Obligation at End of Year	18,225,000		15,764,000		16,284,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	62,298,000		49,391,000
Company Contributions	0		0
Plan Participants' Contributions	336,000		299,000
Benefit Payments from Fund	(645,000)	[1]	(871,000)	[1]
Benefit Payments Directly by Company	0		(65,000)
Actual Return on Assets	5,250,000		13,778,000
Other Adjustment	(299,000)		(234,000)
Fair Value of Plan Assets at End of Year	66,940,000		62,298,000		49,391,000
Change in Accumulated Other Comprehensive Income (AOCI) [Abstract]
AOCI in Prior Year	(41,377,000)		(36,602,000)
Increase/(Decrease) in AOCI [Abstract]
Recognized during year - Prior Service (Cost)/Credit	6,649,000		6,649,000
Recognized during year - Net Actuarial (Losses)/Gains	435,000		0
Occurring during year - Prior Service Cost	0		0
Occurring during year - Net Actuarial Losses/(Gains)	782,000		(11,411,000)
Occurring during year - Net Settlement Losses/(Gains)	0		0
Other adjustments	0		(13,000)
AOCI in Current Year	(33,511,000)		(41,377,000)		(36,602,000)
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)	(142,000)
Weighted-Average Assumptions Used to Determine Benefit Obligations at year end [Abstract]
Discount Rate (in hundredths)	4.00%		4.75%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Year [Abstract]
Discount Rate (in hundredths)	4.75%		3.85%
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%		7.00%
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	2019		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	66,940,000		62,298,000		49,391,000
Company Contributions [Abstract]
Current	0		0
Current + 1	0
Actual Benefit Payments [Abstract]
Current	272,000
Expected Benefit Payments [Abstract]
Current + 1	781,000
Current + 2	837,000
Current + 3	912,000
Current + 4	1,136,000
Current + 5	1,238,000
Current + 6 - 10	8,138,000
Health care trend rate used for pre-65 benefits (in hundredths)	7.00%
Age of retirees at which retirement benefits under the plan are terminated	65 years
Health care trend rate used for pre-65 benefits in 2015 (in hundredths)	7.00%
Health care trend rate used for pre-65 benefits in 2019 (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	50,710,000		45,585,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	50,710,000		45,585,000
Assets at Fair Value [Abstract]
Total Assets at fair value	50,710,000		45,585,000
Other Postretirement Benefits [Member] | International Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	16,230,000		16,713,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	16,230,000		16,713,000
Assets at Fair Value [Abstract]
Total Assets at fair value	16,230,000		16,713,000
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)	70.00%
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] | Real Estate [Member]
Target Allocation of Assets [Abstract]
Target asset allocations, minimum (in hundredths)	0.00%
Target asset allocations, maximum (in hundredths)	15.00%
Other Postretirement Benefits [Member] | Commodities [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] | Level 1 [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	66,940,000		62,298,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	66,940,000		62,298,000
Assets at Fair Value [Abstract]
Total Assets at fair value	66,940,000		62,298,000
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	50,710,000		45,585,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	50,710,000		45,585,000
Assets at Fair Value [Abstract]
Total Assets at fair value	50,710,000		45,585,000
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	16,230,000		16,713,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	16,230,000		16,713,000
Assets at Fair Value [Abstract]
Total Assets at fair value	16,230,000		16,713,000
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	378,701,000		355,704,000
Change in Projected Benefit Obligation [Roll Forward]
Lump sum pension plan benefit payments	11,800,000		13,800,000
Maximum amount of eligible participant vested benefits for which lump sum payment can be elected			200,000
Total increase in benefit obligation using new mortality tables	23,200,000
Percentage of participants electing lump sum payments (in hundredths)	75.00%
Increase in benefit obligation using new mortality tables and lump sum election assumption	14,600,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	355,704,000
Fair Value of Plan Assets at End of Year	378,701,000		355,704,000
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	378,701,000		355,704,000
Pension Plan [Member] | Domestic Mutual Funds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	9,913,000		51,240,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	9,913,000		51,240,000
Assets at Fair Value [Abstract]
Total Assets at fair value	9,913,000		51,240,000
Pension Plan [Member] | Common Stock [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value			60,332,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year			60,332,000
Assets at Fair Value [Abstract]
Total Assets at fair value			60,332,000
Pension Plan [Member] | Corporate Bond [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	200,732,000		134,012,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	200,732,000		134,012,000
Assets at Fair Value [Abstract]
Total Assets at fair value	200,732,000		134,012,000
Pension Plan [Member] | U.S. Government Securities [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	6,561,000		18,819,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	6,561,000		18,819,000
Assets at Fair Value [Abstract]
Total Assets at fair value	6,561,000		18,819,000
Pension Plan [Member] | Municipals [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	65,214,000		33,402,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	65,214,000		33,402,000
Assets at Fair Value [Abstract]
Total Assets at fair value	65,214,000		33,402,000
Pension Plan [Member] | Foreign Bonds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	23,028,000		15,961,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	23,028,000		15,961,000
Assets at Fair Value [Abstract]
Total Assets at fair value	23,028,000		15,961,000
Pension Plan [Member] | Foreign Stocks [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value			2,124,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year			2,124,000
Assets at Fair Value [Abstract]
Total Assets at fair value			2,124,000
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
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year			39,814,000
Assets at Fair Value [Abstract]
Total Assets at fair value			39,814,000
Pension Plan [Member] | Debt Securities [Member]
Allocation of assets at year end [Abstract]
Weighted-average asset allocations of plans (in hundredths)	78.00%		57.00%
Pension Plan [Member] | Equity Securities [Member]
Allocation of assets at year end [Abstract]
Weighted-average asset allocations of plans (in hundredths)	22.00%		43.00%
Target Allocation of Assets [Abstract]
Target asset allocations, maximum (in hundredths)	40.00%
Pension Plan [Member] | ETF's [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	5,636,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	5,636,000
Assets at Fair Value [Abstract]
Total Assets at fair value	5,636,000
Pension Plan [Member] | Pooled Equity Accounts [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	67,617,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	67,617,000
Assets at Fair Value [Abstract]
Total Assets at fair value	67,617,000
Pension Plan [Member] | Level 1 [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	20,876,000		163,084,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	20,876,000		163,084,000
Assets at Fair Value [Abstract]
Total Assets at fair value	20,876,000		163,084,000
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	9,913,000		51,240,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	9,913,000		51,240,000
Assets at Fair Value [Abstract]
Total Assets at fair value	9,913,000		51,240,000
Pension Plan [Member] | Level 1 [Member] | Common Stock [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value			60,332,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year			60,332,000
Assets at Fair Value [Abstract]
Total Assets at fair value			60,332,000
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	5,327,000		9,574,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	5,327,000		9,574,000
Assets at Fair Value [Abstract]
Total Assets at fair value	5,327,000		9,574,000
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
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year			2,124,000
Assets at Fair Value [Abstract]
Total Assets at fair value			2,124,000
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
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year			39,814,000
Assets at Fair Value [Abstract]
Total Assets at fair value			39,814,000
Pension Plan [Member] | Level 1 [Member] | ETF's [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	5,636,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	5,636,000
Assets at Fair Value [Abstract]
Total Assets at fair value	5,636,000
Pension Plan [Member] | Level 1 [Member] | Pooled Equity Accounts [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0
Assets at Fair Value [Abstract]
Total Assets at fair value	0
Pension Plan [Member] | Level 2 [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	357,825,000		192,620,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	357,825,000		192,620,000
Assets at Fair Value [Abstract]
Total Assets at fair value	357,825,000		192,620,000
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 Stock [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value			0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year			0
Assets at Fair Value [Abstract]
Total Assets at fair value			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	200,732,000		134,012,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	200,732,000		134,012,000
Assets at Fair Value [Abstract]
Total Assets at fair value	200,732,000		134,012,000
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	1,234,000		9,245,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	1,234,000		9,245,000
Assets at Fair Value [Abstract]
Total Assets at fair value	1,234,000		9,245,000
Pension Plan [Member] | Level 2 [Member] | Municipals [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	65,214,000		33,402,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	65,214,000		33,402,000
Assets at Fair Value [Abstract]
Total Assets at fair value	65,214,000		33,402,000
Pension Plan [Member] | Level 2 [Member] | Foreign Bonds [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	23,028,000		15,961,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	23,028,000		15,961,000
Assets at Fair Value [Abstract]
Total Assets at fair value	23,028,000		15,961,000
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
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year			0
Assets at Fair Value [Abstract]
Total Assets at fair value			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
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year			0
Assets at Fair Value [Abstract]
Total Assets at fair value			0
Pension Plan [Member] | Level 2 [Member] | ETF's [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0
Assets at Fair Value [Abstract]
Total Assets at fair value	0
Pension Plan [Member] | Level 2 [Member] | Pooled Equity Accounts [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	67,617,000
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	67,617,000
Assets at Fair Value [Abstract]
Total Assets at fair value	67,617,000
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 Stock [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value			0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year			0
Assets at Fair Value [Abstract]
Total Assets at fair value			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
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year			0
Assets at Fair Value [Abstract]
Total Assets at fair value			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
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year			0
Assets at Fair Value [Abstract]
Total Assets at fair value			0
Pension Plan [Member] | Level 3 [Member] | ETF's [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0
Assets at Fair Value [Abstract]
Total Assets at fair value	0
Pension Plan [Member] | Level 3 [Member] | Pooled Equity Accounts [Member]
Funded Status/Asset (Liability) on the Consolidated Balance Sheet [Abstract]
Plan Assets at Fair Value	0
Change in Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	0
Assets at Fair Value [Abstract]
Total Assets at fair value	$ 0

[1] In 2014, includes lump sum payments of $11.8 million from our pension plan to eligible participants, which were former employees with vested benefits. 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.