Pension, Savings and Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2012

Pension, savings and postretirement benefits

Schedule of disclosures related to the pension plans and the postretirement health care coverage

							Postretirement
	Pension Plans						Healthcare Coverage
	2012			2011			2012			2011
Projected benefit obligation at beginning of year	$	25,590		$	21,284		$	12,524		$	11,968
Service cost	455			287			256			179
Interest cost	1,141			1,090			527			573
Plan amendments	951			—			—			—
Actuarial loss	1,766			3,633			1,286			274
Benefits paid	(735		)	(704		)	(502		)	(470		)
Projected benefit obligation at end of year	29,168			25,590			14,091			12,524
Fair value of plan assets at beginning of year	19,609			19,328			—			—
Employer contributions	1,500			1,293			502			471
Actual return on plan assets	1,998			(308		)	—			—
Benefits paid	(735		)	(704		)	(502		)	(471		)
Fair value of plan assets at end of year	22,372			19,609			—			—
Unfunded benefit obligation at end of year	$	(6,796	)	$	(5,981	)	$	(14,091	)	$	(12,524	)

Schedule of the components of the unfunded benefit obligations of the hourly and salaried defined benefit plans

	2012									2011
	Hourly			Salaried						Hourly			Salaried
	Plan			Plan			Total			Plan			Plan			Total
Projected benefit obligation	$	20,474		$	8,694		$	29,168		$	17,775		$	7,815		$	25,590
Fair value of plan assets	15,602			6,770			22,372			13,687			5,922			19,609
Unfunded benefit obligation	$	(4,872	)	$	(1,924	)	$	(6,796	)	$	(4,088	)	$	(1,893	)	$	(5,981	)

Schedule of the components of cost recognized in other comprehensive loss

				Post
	Pension			Retirement
	Plans			Health			Total
Balance at December 31, 2010	$	(8,269	)	$	(1,874	)	$	(10,143	)
Recognized in other comprehensive loss	(4,826		)	(376		)	(5,202		)
Balance at December 31, 2011	(13,095		)	(2,250		)	(15,345		)
Recognized in other comprehensive loss	22			(1,251		)	(1,229		)
Balance at December 31, 2012	$	(13,073	)	$	(3,501	)	$	(16,574	)

Schedule of the estimated amount that will be amortized from accumulated other comprehensive loss into net periodic cost in 2013

			Post
	Pension		Retirement
	Plans		Health
Prior service cost/(gain)	$	—	$	(172	)
Actuarial loss	420		284
Total	$	420	$	112

Schedule of weighted average assumptions used in determining the year-end benefit obligation

	Hourly				Salaried				Postretirement
	Pension Plan				Pension Plan				Healthcare
	2012		2011		2012		2011		2012		2011
Discount rate	3.75	%	4.25	%	4.0	%	4.50	%	3.5	%	4.25	%
Expected return on plan assets	7.5	%	8.00	%	7.5	%	8.00	%	N/A		N/A

Schedule of weighted average assumptions used to determine net periodic cost

Weighted-average assumptions used to determine net periodic cost for the years ended December 31 are as follows:

	Hourly						Salaried
	Pension Plan						Pension Plan
	2012		2011		2010		2012		2011		2010
Discount rate	3.75	%	4.25	%	5.50	%	4.0	%	4.50	%	5.50	%
Expected return on plan assets	7.5	%	8.00	%	8.00	%	7.5	%	8.00	%	8.00	%

	Postretirement Health
	2012		2011		2010
Discount rate	3.5	%	4.25	%	5.50	%
Expected return on plan assets	N/A		N/A		N/A

Schedule of allocation by asset category

	Fair Value Measurements at
	December 31, 2012
			Allocation
	Total		Percent		Level 1		Level 2		Level 3
Equity mutual funds	$	11,344	51	%	$	11,344	$	—	$	—
Fixed income mutual funds	7,193		32	%	7,193		—		—
Money market funds	644		3	%	644		—		—
Stable value	3,191		14	%	—		3,191		—
	$	22,372	100	%	$	19,181	$	3,191	$	—

	Fair Value Measurements at
	December 31, 2011
			Allocation
	Total		Percent		Level 1		Level 2		Level 3
Equity mutual funds	$	9,858	50	%	$	9,858	$	—	$	—
Fixed income mutual funds	6,211		32	%	6,211		—		—
Money market funds	384		2	%	384		—		—
Stable value	3,156		16	%	—		3,156		—
	$	19,609	100	%	$	16,453	$	3,156	$	—

Schedule of benefit payments, which reflect future service as appropriate, which are expected to be paid

			Post
	Pension		Retirement
Years ending	Plans		Health
2013	$	1,337	$	626
2014	1,349		672
2015	1,354		709
2016	1,403		750
2017	1,445		784
2018-2022	7,756		4,228

Pension plans

Pension, savings and postretirement benefits

Schedule of the components of cost recognized in the statement of operations

	December 31,
	2012			2011			2010
Service cost	$	455		$	287		$	361
Interest cost	1,141			1,090			1,123
Expected return on assets	(1,641		)	(1,549		)	(1,389		)
Curtailment of hourly plan	1,325			—			—
Amortization of unrecognized prior service costs	244			170			170
Amortization of unrecognized loss	813			495			358
Net periodic cost	$	2,337		$	493		$	623

Postretirement health cost coverage

Pension, savings and postretirement benefits

Schedule of the components of cost recognized in the statement of operations

	December 31,
	2012			2011			2010
Service cost	$	256		$	179		$	201
Interest cost	527			573			612
Amortization of unrecognized prior service costs	(172		)	(172		)	(212		)
Amortization of unrecognized loss	208			70			91
Effect of curtailments and settlements	—			—			(714		)
Net periodic cost (income)	$	819		$	650		$	(22	)