CWP and Workers Comp (Tables)

12 Months Ended

Dec. 31, 2011

Defined Benefit Plan Disclosure [Line Items]

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

				Other
	Pension			Postretirement
	Benefits			Benefits
Prior Service cost (benefit) recognition	$	(1,630	)	$	(46,397	)
Actuarial loss recognition	$	49,049		$	81,380

Schedule of Assumptions Used [Table Text Block]

The weighted-average assumptions used to determine benefit obligations are as follows:

	Pension Benefits				Other Postretirement Benefits
	For the Year Ended				For the Year Ended
	December 31,				December 31,
	2011		2010		2011		2010
Discount rate	4.50	%	5.30	%	4.51	%	5.33	%
Rate of compensation increase	3.77	%	3.68	%	—		—

The weighted-average assumptions used to determine net periodic benefit costs are as follows:

	Pension Benefits at						Other Postretirement Benefits at
	December 31,						December 31,
	2011		2010		2009		2011		2010		2009
Discount rate	5.30	%	5.79	%	6.28	%	5.33	%	5.87	%	6.20	%
Expected long-term return on plan assets	8.00	%	8.00	%	8.00	%	—		—		—
Rate of compensation increase	3.66	%	4.14	%	4.05	%	—		—		—

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]

Assumed discount rates also have a significant effect on the amounts reported for both pension and other benefit costs. A one-quarter percentage point change in assumed discount rate would have the following effect on benefit costs:

	0.25 Percentage			0.25 Percentage
	Point Increase			Point Decrease
Pension benefit costs (decrease) increase	$	(1,948	)	$	1,965
Other postemployment benefits costs (decrease) increase	$	(4,666	)	$	5,543

Schedule of Expected Benefit Payments [Table Text Block]

The following benefit payments, reflecting expected future service, are expected to be paid:

Workers Comp and CWP [Member]

Defined Benefit Plan Disclosure [Line Items]

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

	CWP						Workers' Compensation
	at December 31,						at December 31,
	2011			2010			2011			2010
Change in benefit obligation:
Benefit obligation at beginning of period	$	184,531		$	194,641		$	174,456		$	179,268
State administrative fees and insurance bond premiums	—			—			7,035			7,816
Service, legal and administrative cost	7,620			8,067			20,015			30,399
Interest cost	9,330			10,789			8,238			9,156
Actuarial gain	(6,783		)	(17,381		)	(2,783		)	(14,553		)
Benefits paid	(11,118		)	(11,585		)	(32,892		)	(37,630		)
Benefit obligation at end of period	$	183,580		$	184,531		$	174,069		$	174,456
Current liabilities	$	(10,027	)	$	(10,915	)	$	(24,837	)	$	(27,754	)
Noncurrent liabilities	(173,553		)	(173,616		)	(149,232		)	(146,702		)
Net obligation recognized	$	(183,580	)	$	(184,531	)	$	(174,069	)	$	(174,456	)
Amounts recognized in accumulated other comprehensive income consist of:
Net actuarial gain	$	(164,374	)	$	(178,772	)	$	(55,233	)	$	(56,358	)
Prior service credit	(395		)	(1,123		)	—			—
Net amount recognized (before tax effect)	$	(164,769	)	$	(179,895	)	$	(55,233	)	$	(56,358	)

Schedule of Net Benefit Costs [Table Text Block]

The components of the net periodic cost (credit) are as follows:

	CWP									Workers’ Compensation
	For the Years Ended									For the Years Ended
	December 31,									December 31,
	2011			2010			2009			2011			2010			2009
Service cost	$	4,620		$	5,067		$	7,074		$	17,872		$	27,015		$	28,394
Interest cost	9,330			10,789			12,054			8,238			9,156			8,765
Legal and administrative costs	3,000			3,000			2,700			2,143			3,384			3,401
Amortization of prior service cost	(728		)	(728		)	(728		)	—			—			—
Recognized net actuarial gain	(21,182		)	(21,585		)	(19,590		)	(3,907		)	(3,072		)	(4,200		)
State administrative fees and insurance bond premiums	—			—			—			7,035			7,816			6,710
Net periodic cost (credit)	$	(4,960	)	$	(3,457	)	$	1,510		$	31,381		$	44,299		$	43,070

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

Amounts included in accumulated other comprehensive income, expected to be recognized in 2012 net periodic benefit costs:

				Workers'
	CWP			Compensation
	Benefits			Benefits
Prior Service benefit recognition	$	(395	)	$	—
Actuarial gain recognition	$	(19,338	)	$	(3,944	)

Schedule of Assumptions Used [Table Text Block]

Assumptions:

The weighted-average discount rate used to determine benefit obligations and net periodic (benefit) cost are as follows:

	CWP						Workers' Compensation
	For the Years Ended						For the Years Ended
	December 31,						December 31,
	2011		2010		2009		2011		2010		2009
Benefit obligations	4.46	%	5.21	%	5.84	%	4.40	%	5.13	%	5.55	%
Net Periodic (benefit) costs	5.21	%	5.84	%	6.23	%	5.13	%	5.55	%	5.90	%

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]

Assumed discount rates have a significant effect on the amounts reported for both CWP benefits and Workers' Compensation costs. A one-quarter percentage point change in assumed discount rate would have the following effect on benefit costs:

	0.25 Percentage			0.25 Percentage
	Point Increase			Point Decrease
CWP benefit increase (decrease)	$	634		$	(606	)
Workers' Compensation costs (decrease) increase	$	(686	)	$	721

Schedule of Expected Benefit Payments [Table Text Block]

The following benefit payments, which reflect expected future claims as appropriate, are expected to be paid:

			Workers' Compensation
	CWP		Total		Actuarial		Other
	Benefits		Benefits		Benefits		Benefits
2012	$	10,027	$	31,375	$	24,837	$	6,538
2013	$	10,280	$	31,360	$	24,658	$	6,702
2014	$	10,533	$	31,576	$	24,707	$	6,869
2015	$	10,721	$	31,925	$	24,884	$	7,041
2016	$	10,856	$	32,328	$	25,111	$	7,217
Year 2017-2021	$	54,752	$	169,785	$	130,900	$	38,885