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CWP and Workers Comp (Tables)

12 Months Ended

Dec. 31, 2014

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 credit recognition		$	(704	)		$	(58,546	)
Actuarial loss recognition		$	27,760			$	35,705

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,
		2014			2013			2014			2013
Discount rate		4.07	%		4.87	%		3.80	%		4.88	%
Rate of compensation increase		3.80	%		4.23	%		—			—

The discount rates are determined using a Company-specific yield curve model (above-mean) developed with the assistance of an external actuary. The Company-specific yield curve models (above-mean) use a subset of the expanded bond universe to determine the Company-specific discount rate.  Bonds used in the yield curve are rated AA by Moody's or Standard & Poor's as of the measurement date. The yield curve models parallel the plans' projected cash flows, and the underlying cash flows of the bonds included in the models exceed the cash flows needed to satisfy the Company plans'.

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,
		2014			2013			2012			2014			2013			2012
Discount rate		4.87	%		4.00	%		4.50	%		4.88	%		4.05	%		4.51	%
Expected long-term return on plan assets		7.75	%		7.75	%		8.00	%		—			—			—
Rate of compensation increase		4.21	%		3.77	%		3.82	%		—			—			—

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		$	(1,955	)		$	1,914
Other postemployment benefits costs (decrease) increase		$	(3,476	)		$	3,663

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 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,
	2014				2013				2012				2014				2013				2012
Service cost	$	5,674			$	8,168			$	7,711			$	9,781			$	15,943			$	17,126
Interest cost	5,537				7,031				7,964				3,577				6,401				7,113
Amortization of prior service cost	—				—				(395		)		—				—				—
Recognized net actuarial gain	(6,196		)		(16,384		)		(19,338		)		(382		)		(2,630		)		(3,944		)
State administrative fees and insurance bond premiums	—				—				—				3,352				5,324				6,727
Settlement gain	—				(119,881		)		—				—				(121,838		)		—
Net periodic cost (credit)	$	5,015			$	(121,066	)		$	(4,058	)		$	16,328			$	(96,800	)		$	27,022

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

Following are amounts included in accumulated other comprehensive income that are expected to be recognized in 2015 net periodic benefit costs:

						Workers'
		CWP				Compensation
		Benefits				Benefits
Actuarial gain recognition		$	(5,576	)		$	(30	)

Schedule of Assumptions Used [Table Text Block]

Assumptions:

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

		CWP									Workers' Compensation
		For the Years Ended									For the Years Ended
		December 31,									December 31,
		2014			2013			2012			2014			2013			2012
Benefit obligations		4.21	%		4.75	%		4.03	%		3.84	%		4.57	%		3.95	%
Net periodic cost (benefit)		4.75	%		4.03	%		4.46	%		4.57	%		3.95	%		4.40	%

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 costs 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 costs (decrease) increase		$	(134	)		$	138
Workers' compensation costs (decrease) increase		$	(95	)		$	102

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
2015			$	9,156			$	17,101			$	13,795			$	3,306
2016			$	7,483			$	17,027			$	13,639			$	3,388
2017			$	6,802			$	17,123			$	13,650			$	3,473
2018			$	6,402			$	17,287			$	13,727			$	3,560
2019			$	6,207			$	17,443			$	13,794			$	3,649
Year 2020-2024			$	29,376			$	91,222			$	71,563			$	19,659

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