Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2012

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

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

	Pension						Postretirement
	2012			2011			2012			2011
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year	$	413,147		$	346,464		$	24,833		$	21,158
Service cost	8,407			6,782			918			673
Interest cost	17,284			18,087			956			972
Actuarial loss	32,666			58,208			2,021			3,934
Plan amendments	—			—			—			(631		)
Employee contributions	—			—			1,136			1,609
Benefits paid	(17,034		)	(16,394		)	(2,282		)	(2,882		)
Projected benefit obligation at end of year	$	454,470		$	413,147		$	27,582		$	24,833

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

Change in Plan Assets
Fair value of plan assets at beginning of year	$	295,655		$	302,464		$	—		$	—
Actual return on plan assets	41,729			8,977			—			—
Employer contributions	1,565			1,552			1,146			1,273
Employee contributions	—			—			1,136			1,609
Benefits paid	(17,034		)	(16,394		)	(2,282		)	(2,882		)
Other expense	(1,216		)	(944		)	—			—
Fair value of plan assets at end of year	$	320,699		$	295,655		$	—		$	—

Schedule of Net Funded Status [Table Text Block]

Funded Status at End of Year:
Net accrued benefit cost	$	(133,771	)	$	(117,492	)	$	(27,582	)	$	(24,833	)

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

Amounts Recognized in the Consolidated
Balance Sheets Consist of:
Current liabilities	$	(1,702	)	$	(1,626	)	$	(1,256	)	$	(1,262	)
Noncurrent liabilities	(132,069		)	(115,866		)	(26,326		)	(23,571		)
Net amount recognized	$	(133,771	)	$	(117,492	)	$	(27,582	)	$	(24,833	)

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

Net gains or losses and prior service costs or credits recognized in other comprehensive income for the three years ended December 31 are as follows:

	Pension									Postretirement
	2012			2011			2010			2012			2011			2010
Net (losses) gains	$	(17,630	)	$	(75,995	)	$	1,348		$	(2,021	)	$	(3,934	)	$	(965	)
Prior service cost	—			—			(1,704		)	—			631			—

Net gains or losses and prior service costs or credits reclassified from other comprehensive income and recognized as a component of pension and postretirement expense for the three years ended December 31 are as follows:

	Pension						Postretirement
	2012		2011		2010		2012		2011		2010
Amortization of losses	$	17,578	$	10,372	$	6,456	$	582	$	570	$	3,357
Amortization of prior service cost (benefit)	1,308		1,359		1,657		25		69		(5,334		)

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

Net losses and prior service costs or credits that have not yet been included in pension and postretirement expense for the two years ended December 31, which have been recognized as a component of AOCI are as follows:

	Pension						Postretirement
	2012			2011			2012			2011
Prior service (cost) credit	$	(7,062	)	$	(8,370	)	$	193		$	167
Net losses	(191,813		)	(191,761		)	(11,939		)	(10,500		)
Deferred income tax benefit	61,968			62,797			4,073			3,583
AOCI	$	(136,907	)	$	(137,334	)	$	(7,673	)	$	(6,750	)

Schedule of Projected Benefit Obligation and Accumulated Benefit Obligation in Excess of Fair Value [Table Text Block]

For pension and postretirement plans with accumulated benefit obligations in excess of plan assets, the following table sets forth the projected and accumulated benefit obligations and the fair value of plan assets for the two years ended December 31:

	2012		2011
Projected benefit obligation	$	482,052	$	437,980
Accumulated benefit obligation	434,810		392,182
Fair value of plan assets	320,699		295,655

Schedule of Net Benefit Costs [Table Text Block]

The following tables set forth the components of net pension and postretirement benefit cost that have been recognized during the three years ended December 31:

	Pension									Postretirement
	2012			2011			2010			2012		2011		2010
Components of Net Periodic Benefit Cost
Service cost	$	8,407		$	6,782		$	6,196		$	918	$	673	$	587
Interest cost	17,284			18,087			17,740			956		972		1,029
Expected return on plan assets	(25,477		)	(25,819		)	(21,651		)	—		—		—
Amortization of prior service cost (benefit)	1,308			1,359			1,657			25		69		(5,334		)
Amortization of losses	17,578			10,372			6,456			582		570		3,357
Net periodic benefit cost (benefit)	$	19,100		$	10,781		$	10,398		$	2,481	$	2,284	$	(361	)

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

The estimated pre-tax amounts that will be amortized from AOCI into net periodic benefit cost in 2013 are as follows:

	Pension		Postretirement
Amortization of loss	$	19,215	$	711
Amortization of prior service cost	1,308		25
Total amortization of AOCI loss	$	20,523	$	736

Schedule of Assumptions Used [Table Text Block]

The following table sets forth the principal assumptions inherent in the determination of benefit obligations and net periodic benefit cost of the pension and postretirement benefit plans as of December 31:

	Pension						Postretirement
	2012		2011		2010		2012		2011		2010
Assumptions used to determine benefit obligations at December 31:
Discount rate	3.70	%	4.20	%	5.25	%	3.60	%	4.10	%	5.10	%
Rate of compensation increase	4.60	%	4.50	%	4.50	%	4.50	%	4.50	%	4.50	%
Assumptions used to determine net periodic benefit cost for years ended December 31:
Discount rate	4.20	%	5.25	%	5.80	%	4.10	%	5.10	%	5.50	%
Expected long-term return on plan assets	8.50	%	8.50	%	8.50	%	—		—		—
Rate of compensation increase	4.50	%	4.50	%	4.50	%	4.50	%	4.50	%	4.50	%

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

The following table sets forth the assumed health care cost trend rates at December 31:

	Postretirement
	2012		2011
Health care cost trend rate assumed for next year	7.50	%	8.00	%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)	5.00	%	5.00	%
Year that the rate reaches the ultimate trend rate	2017		2017

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

The following table shows the effect of a one percentage point change in assumed health care cost trends:

	1 Percent
Effect on:	Increase		Decrease
Total of service and interest cost components	$	226	$	(187	)
Accumulated postretirement benefit obligation	2,089		(1,785		)

Schedule of Allocation of Plan Assets [Table Text Block]

The following table sets forth by level, within the fair value hierarchy (see Note 2 — Summary of Significant Accounting Policiesfor definition), the assets of the plans as of December 31, 2012 and 2011. Prior year level designations have been corrected to designate assets held in collective trust funds as level two. Management does not believe such correction is material to the previously issued financial statements.

	Fair Value at December 31, 2012						Fair Value at December 31, 2011
Asset Category	Level 1		Level 2		Total		Level 1		Level 2		Total
Domestic equity securities	$	50,653	$	76,251	$	126,904	$	128,834	$	—	$	128,834
International equity securities	51,758		27,173		78,931		57,728		—		57,728
Domestic fixed income securities	—		81,045		81,045		—		80,243		80,243
International fixed income securities	15,745		—		15,745		14,381		—		14,381
Real estate fund	10,208		—		10,208		9,846		—		9,846
Short-term investments	29		7,837		7,866		236		4,387		4,623
Total	$	128,393	$	192,306	$	320,699	$	211,025	$	84,630	$	295,655

The Company’s pension plans’ asset allocation at December 31, 2012 and 2011, and target allocation ranges by asset category are as follows:

	Percentage of Plan Assets				Target Allocation Range
Asset Category	2012		2011
Domestic equity securities	41	%	44	%	40-45%
International equity securities	25	%	20	%	20-30%
Domestic fixed income securities	26	%	28	%	25-30%
International fixed income securities	5	%	5	%	4-6%
Real estate fund	3	%	3	%	2-4%
Total	100	%	100	%

Schedule of Expected Benefit Payments [Table Text Block]

Expected benefit payments for the next ten years are as follows:

	Pension Benefits		Postretirement Benefits
2013	$	18,903	$	1,256
2014	19,951		1,375
2015	20,979		1,436
2016	21,999		1,507
2017	23,011		1,526
2018 - 2022	128,704		7,701