Employee Benefit Plans Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2012

Defined Benefit Plan Disclosure [Line Items]

Schedule of Allocation of Plan Assets [Table Text Block]

The percentages of total plan asset fair value by investment category of our Pension Plan assets at December 31 were as follows:

	2012		2011
Equity securities	51	%	69	%
Fixed income funds	48	%	28	%
Cash and cash equivalents	1	%	3	%
Total	100	%	100	%

Schedule of Defined Contribution Plans Contributions [Table Text Block]

Contributions for the years ended December 31 were as follows (in thousands):

	2012		2011
Defined Benefit Plans
Defined Benefit Pension Plan	$	6,835	$	—
Non-pension Defined Benefit Postretirement Healthcare Plan	$	835	$	428
Supplemental Non-qualified Defined Benefit Plan	$	256	$	130
Defined Contribution Plans
Company Retirement Contribution	$	404	$	371
Matching Contributions	$	1,328	$	1,296

Schedule of Changes in Projected Benefit Obligations [Table Text Block]

The following tables provide a reconciliation of the Employee Benefit Plan's obligations and fair value of assets, components of the net periodic expense and elements of regulatory assets and liabilities and AOCI (in thousands):

Benefit Obligations

	Defined Benefit Pension Plan						Supplemental Non-qualified Defined Benefit Retirement Plans						Non-pension Defined Benefit Postretirement Healthcare Plan
	2012			2011			2012			2011			2012			2011
Change in benefit obligation:
Projected benefit obligation at beginning of year	$	65,557		$	57,753		$	2,292		$	2,152		$	8,207		$	7,517
Service cost	765			798			—			—			214			210
Interest cost	2,969			3,092			104			114			343			365
Actuarial loss (gain)	4,510			852			1,287			(30		)	(1,748		)	(308		)
Amendments	—			—			—			—			—			—
Change in participant assumptions	—			—			—			—			—			171
Discount rate change	—			6,668			—			186			—			433
Benefits paid	(2,850		)	(2,899		)	(256		)	(130		)	(835		)	(707		)
Asset transfer (to) from affiliate	(1,131		)	(707		)	—			—			26			(40		)
Plan curtailment reduction	—			—			—			—			—			—
Medicare Part D adjustment	—			—			—			—			71			67
Plan participants' contributions	—			—			—			—			488			499
Projected benefit obligation at end of year	$	69,820		$	65,557		$	3,427		$	2,292		$	6,766		$	8,207

Schedule of Changes in Fair Value of Plan Assets [Table Text Block]

A reconciliation of the fair value of Plan assets (as of the December 31 measurement date) is as follows (in thousands):

	Defined Benefit Pension Plan						Supplemental Non-qualified Defined Benefit Retirement Plans				Non-pension Defined Benefit Postretirement Healthcare Plan
	2012			2011			2012		2011		2012		2011
Beginning market value of plan assets	$	45,017		$	48,228		$	—	$	—	$	—	$	—
Investment income	5,240			66			—		—		—		—
Benefits paid	(2,850		)	(2,899		)	—		—		—		—
Employer contributions	6,835			—			—		—		—		—
Asset transfer to affiliate	(777		)	(378		)	—		—		—		—
Ending market value of plan assets	$	53,465		$	45,017		$	—	$	—	$	—	$	—

Schedule of Amounts Recognized in Balance Sheet [Table Text Block]

Amounts recognized in the Balance Sheets at December 31 consist of (in thousands):

	Defined Benefit Pension Plan						Supplemental Non-qualified Defined Benefit Retirement Plans						Non-pension Defined Benefit Postretirement Plan
	2012			2011			2012			2011			2012			2011
Regulatory asset (liability)	$	26,683		$	27,284		$	—		$	—		$	(2,174	)	$	(590	)
Current (liability)	$	—		$	—		$	(216	)	$	(154	)	$	(438	)	$	(658	)
Non-current (liability)	$	(16,356	)	$	(20,540	)	$	(3,211	)	$	(3,060	)	$	(6,321	)	$	(7,497	)

Schedule of Accumulated and Projected Benefit Obligations [Table Text Block]

Accumulated Benefit Obligation (dollars in thousands)

	Defined Benefit Pension Plan				Supplemental Non-qualified Defined Benefit Retirement Plans				Non-pension Defined Benefit Postretirement Healthcare Plan
	2012		2011		2012		2011		2012		2011
Accumulated benefit obligation	$	63,417	$	59,823	$	3,427	$	2,292	$	6,766	$	8,207

Schedule of Net Benefit Costs [Table Text Block]

Components of Net Periodic Expense (dollars in thousands)

	Defined Benefit Pension Plan									Supplemental Non-qualified Defined Benefit Retirement Plans						Non-pension Defined Benefit Postretirement Healthcare Plan
	2012			2011			2010			2012		2011		2010		2012			2011			2010
Service cost	$	765		$	798		$	1,214		$	—	$	—	$	—	$	214		$	210		$	340
Interest cost	2,969			3,092			3,280			104		114		100		343			365			547
Expected return on assets	(3,139		)	(3,619		)	(3,008		)	—		—		—		—			—			—
Amortization of prior service cost (credits)	57			62			62			—		—		—		(278		)	(314		)	(141		)
Amortization of transition obligation	—			—			—			—		—		—		—			—			171
Recognized net actuarial loss (gain)	2,599			1,486			1,378			55		48		30		139			163			—
Curtailment expense	—			—			57			—		—		—		—			—			—
Net periodic expense	$	3,251		$	1,819		$	2,983		$	159	$	162	$	130	$	418		$	424		$	917

Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]

Amounts included in AOCI, after-tax, that have not yet been recognized as components of net periodic benefit cost at December 31 were as follows (in thousands):

	Defined Benefit Pension Plan				Supplemental Non-qualified Defined Benefit Retirement Plans						Non-pension Defined Benefit Postretirement Healthcare Plan
	2012		2011		2012			2011			2012		2011
Net loss	$	—	$	—	$	(660	)	$	(489	)	$	—	$	—
Prior service cost	—		—		—			—			—		—
Total accumulated other comprehensive income (loss)	$	—	$	—	$	(660	)	$	(489	)	$	—	$	—

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

The amounts in AOCI, regulatory assets or regulatory liabilities, after-tax, expected to be recognized as a component of net periodic benefit cost during calendar year 2013 were as follows (in thousands):

	Defined Benefits Pension Plan		Supplemental Non-qualified Defined Benefit Retirement Plans		Non-pension Defined Benefit Postretirement Healthcare Plan
Net loss	$	1,696	$	43	$	6
Prior service cost	27		—		(181		)
Total net periodic benefit cost expected to be recognized during calendar year 2013	$	1,723	$	43	$	(175	)

Schedule of Assumptions Used [Table Text Block]

Assumptions

	Defined Benefit Pension Plan						Supplemental Non-qualified Defined Benefit Retirement Plans						Non-pension Defined Benefit Postretirement Healthcare Plan
	2012		2011		2010		2012		2011		2010		2012		2011		2010
Weighted-average assumptions used to determine benefit obligations:
Discount rate	4.35	%	4.65	%	5.50	%	4.25	%	4.70	%	5.50	%	3.65	%	4.35	%	5.00	%
Rate of increase in compensation levels	3.91	%	3.67	%	3.70	%	N/A		N/A		5.00	%	N/A		N/A		N/A
Weighted-average assumptions used to determine net periodic benefit cost for plan year:
Discount rate	4.65	%	5.50	%	6.05	%	4.70	%	5.00	%	6.10	%	4.35	%	5.00	%	5.90	%
Expected long-term rate of return on assets*	7.25	%	7.75	%	8.00	%	N/A		N/A		N/A		N/A		N/A		N/A
Rate of increase in compensation levels	3.67	%	3.70	%	4.25	%	N/A		N/A		5.00	%	N/A		N/A		N/A

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* The expected rate of return on plan assets is 7.25% for the calculation of the 2013 net periodic pension cost.

Schedule of Health Care Cost Trend Rates [Table Text Block]

The healthcare benefit obligation was determined at December 31 as follows:

	2012		2011
Healthcare trend rate pre-65
Trend for next year	7.75	%	9.01	%
Ultimate trend rate	4.50	%	4.50	%
Year Ultimate Trend Reached	2027		2027
Healthcare trend rate post-65
Trend for next year	6.50	%	9.01	%
Ultimate trend rate	4.50	%	4.50	%
Year Ultimate Trend Reached	2026		2027

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]

The table below shows the estimated impacts of an increase or decrease to our healthcare trend rate for our Retiree Health Care Plan (dollars in thousands):

Change in Assumed Trend Rate	Service and Interest Costs			Accumulated Periodic Postretirement Benefit Obligation
1% increase	$	11		$	278
1% decrease	$	(10	)	$	(250	)

Schedule of Expected Benefit Payments [Table Text Block]

The following benefit payments, which reflect future service, are expected to be paid (in thousands):

	Defined Benefit Pension Plan		Supplemental Non-qualified Defined Benefit Retirement Plans		Non-pension Defined Benefit Postretirement Healthcare Plan
2013	$	3,150	$	216	$	438
2014	$	3,227	$	215	$	489
2015	$	3,325	$	212	$	455
2016	$	3,417	$	181	$	469
2017	$	3,516	$	212	$	498
2018-2021	$	20,144	$	1,187	$	2,728

Pension Plans, Defined Benefit [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following tables set forth, by level within the fair value hierarchy, the assets that were accounted for at fair value on a recurring basis as of December 31 (in thousands):

Defined Benefit Pension Plan	2012
	Level 1		Level 2		Level 3		Total Fair Value
Cash and cash equivalents	$	535	$	—	$	—	$	535
Common collective trust - equity	—		27,267		—		27,267
Common collective trust - fixed income	—		21,127		—		21,127
Insurance contracts	—		—		—		—
Structured products	—		4,536		—		4,536
Total investments measured at fair value	$	535	$	52,930	$	—	$	53,465

Defined Benefit Pension Plan	2011
	Level 1		Level 2		Level 3		Total Fair Value
Cash and cash equivalents	$	40	$	—	$	—	$	40
Registered investment companies - equity	12,743		—		—		12,743
Registered investment companies - fixed income	12,603		—		—		12,603
Common collective trust - equity	—		16,143		—		16,143
Insurance contracts	—		1,288		—		1,288
Structured products	—		2,200		—		2,200
Total investments measured at fair value	$	25,386	$	19,631	$	—	$	45,017