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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2016

General Discussion Of Pension And Other Postretirement Benefits [Abstract]

Schedule of Changes in Projected Benefit Obligations

The change in benefit obligation, change in plan assets and funded status for company-sponsored benefit plans and obligations are as follows:

	Pension Plans						Other Postretirement Employee Benefits
(Dollars in thousands)	2016			2015			2016			2015
Benefit obligation at beginning of year	$	(382,071	)	$	(417,694	)	$	(35,471	)	$	(41,561	)
Service cost		(6,508	)		(6,159	)		(14	)		(22	)
Interest cost		(17,020	)		(17,012	)		(1,421	)		(1,456	)
Actuarial gain (loss)		(13,997	)		27,094			(313	)		3,778
Benefits paid		34,135			31,700			3,882			3,790
Benefit obligation at end of year	$	(385,461	)	$	(382,071	)	$	(33,337	)	$	(35,471	)

Fair value of plan assets at beginning of year	$	292,200		$	337,059		$	—		$	—
Actual return on plan assets		28,626			(14,970	)		—			—
Employer contributions and benefit payments		2,984			1,811			3,882			3,790
Benefits paid		(34,135	)		(31,700	)		(3,882	)		(3,790	)
Fair value of plan assets at end of year	$	289,675		$	292,200		$	—		$	—

Amounts recognized in the consolidated balance sheets:
Current liabilities	$	(1,824	)	$	(1,791	)	$	(4,015	)	$	(4,182	)
Noncurrent liabilities		(93,962	)		(88,080	)		(29,322	)		(31,289	)
Funded status	$	(95,786	)	$	(89,871	)	$	(33,337	)	$	(35,471	)

Schedule of Weighted Average Asset Allocations of the Pension Benefit Plans' Assets

The asset allocations of the pension benefit plans’ assets at December 31 by asset category are as follows:

	Pension Plans
Asset Category		2016		2015
Domestic and international equities		36	%	35	%
Fixed income securities		48		48
Other (includes cash and equivalents and alternatives)		16		17
Total		100	%	100	%

Schedule of Allocation of Plan Assets

Fair value measurements are as follows:

(Dollars in thousands)	December 31, 2016
Asset Category	Level 1		Level 2		Total
Cash and cash equivalents	$	2,845	$	—	$	2,845
Domestic equity securities¹		25,409		26,279		51,688
International equity securities²		—		26,555		26,555
Emerging markets³		12		26,391		26,403
Fixed income securities⁴		138,897		—		138,897
Alternatives⁵		—		43,287		43,287
Total	$	167,163	$	122,512	$	289,675

(Dollars in thousands)	December 31, 2015
Asset Category	Level 1		Level 2		Total
Cash and cash equivalents	$	5,591	$	—	$	5,591
Domestic equity securities¹		26,253		25,619		51,872
International equity securities²		411		25,733		26,144
Emerging markets³		1,831		23,681		25,512
Fixed income securities⁴		138,906		—		138,906
Alternatives⁵		—		44,175		44,175
Total	$	172,992	$	119,208	$	292,200

¹	Level 1 assets are managed investments in U.S. small/mid-cap equities that track the Russell 2500 Growth index or Russell 2500 Value index. Level 2 assets are collective investments, which are invested in U.S. large-cap equities that track the S&P 500.

²	Level 1 assets are managed investments in small/mid-cap equities across developed markets around the world. Level 2 assets are collective investments in equity funds of developed markets outside of the United States and Canada that track the MSCI EAFE Value index or MSCI EAFE Growth index.

Level 1 assets are mutual funds which are invested in the common stock of companies located (or with primary operations) in emerging markets that track the MSCI Emerging Markets index. Level 2 assets are collective investments in the common stock of companies located (or with primary operations) in emerging markets that track the MSCI Emerging Markets index.

⁴	Level 1 assets are mutual funds and investments in a diversified portfolio of fixed income instruments of varying maturities representing corporates, sovereign debt, U.S. treasuries and municipals that track the Barclay's Long Term Credit index.

⁵

Level 2 assets are collective investments in inflation-indexed bonds, securities of real estate companies, commodity index-linked notes, fixed income securities, foreign currencies, securities of natural resource companies, master limited partnerships, publicly listed infrastructure companies, floating-rate debt, securities of global agriculture companies and securities of global timber companies.

Pre-tax Components of Net Periodic Cost (Benefit)

Pre-tax components of net periodic cost (benefit) recognized in our Consolidated Statements of Income were as follows:

	Pension Plans									Other Postretirement Employee Benefits
(Dollars in thousands)		2016			2015			2014			2016			2015			2014
Service cost	$	6,508		$	6,159		$	5,081		$	14		$	22		$	25
Interest cost		17,020			17,012			19,184			1,421			1,456			1,741
Expected return on plan assets		(18,999	)		(20,804	)		(24,512	)		—			—			—
Amortization of prior service cost (credit)		518			605			748			(8,877	)		(9,312	)		(9,641	)
Amortization of actuarial loss		16,339			17,937			14,451			1,717			2,047			2,186
Net periodic cost (benefit)	$	21,386		$	20,909		$	14,952		$	(5,725	)	$	(5,787	)	$	(5,689	)

Schedule of Amounts Recognized in Other Comprehensive Income (Loss)

Other amounts recognized in our Consolidated Statements of Comprehensive Income were as follows:

	Pension Plans									Other Postretirement Employee Benefits
(Dollars in thousands)		2016			2015			2014			2016			2015			2014
Net amount at beginning of year	$	128,244		$	134,261		$	117,167		$	(13,741	)	$	(15,869	)	$	(18,447	)
Amounts arising during the period:
Net loss (gain)		4,370			8,680			43,223			313			(3,777	)		(3,229	)
Taxes		(1,704	)		(3,386	)		(16,857	)		(122	)		1,473			1,259
Net amount arising during the period		2,666			5,294			26,366			191			(2,304	)		(1,970	)

Amounts reclassified during the period:
Amortization of prior service (cost) credit		(518	)		(605	)		(748	)		8,877			9,312			9,641
Amortization of actuarial loss		(16,339	)		(17,937	)		(14,451	)		(1,717	)		(2,047	)		(2,186	)
Taxes		6,574			7,231			5,927			(2,792	)		(2,833	)		(2,907	)
Net reclassifications during the period		(10,283	)		(11,311	)		(9,272	)		4,368			4,432			4,548
Net amount at end of year	$	120,627		$	128,244		$	134,261		$	(9,182	)	$	(13,741	)	$	(15,869	)

Schedule of Accumulated Other Comprehensive Income (Loss)

Amounts recognized in accumulated other comprehensive loss on our Consolidated Balance Sheets, net of tax, consist of:

	Pension Plans				Other Postretirement Employee Benefits
(Dollars in thousands)	2016		2015			2016			2015
Net loss	$	120,006	$	127,307	$	8,778		$	9,634
Prior service cost (credit)		621		937		(17,960	)		(23,375	)
Net amount recognized	$	120,627	$	128,244	$	(9,182	)	$	(13,741	)

Schedule of Expected Future Benefit Payments

Estimated future benefit payments, which reflect expected future service are as follows for the years indicated:

(Dollars in thousands)	Pension Plans		Other Postretirement Employee Benefits
2017	$	28,846	$	4,015
2018	$	28,534	$	3,727
2019	$	28,189	$	3,470
2020	$	27,964	$	3,255
2021	$	27,609	$	2,987
2022–2026	$	132,424	$	11,940

Weighted Average Assumptions Used to Determine the Benefit Obligation

The weighted average assumptions used to determine the benefit obligation as of December 31 were:

	Pension Plans							Other Postretirement Employee Benefits
		2016		2015		2014			2016		2015		2014
Discount rate		4.40	%	4.65	%	4.25	%		4.10	%	4.25	%	3.90	%
Rate of salaried compensation increase		3.00	%	3.00	%	3.00	%		—		—		—

Schedule of Weighted Average Assumptions Used to Determine the Net Periodic Cost (Benefit)

The weighted average assumptions used to determine the net periodic cost (benefit) for the years ended December 31 were:

	Pension Plans							Other Postretirement Employee Benefits
		2016		2015		2014			2016		2015		2014
Discount rate		4.65	%	4.25	%	5.10	%		4.25	%	3.90	%	4.45	%
Expected return on plan assets		6.50	%	6.75	%	7.50	%		—		—		—
Rate of salaried compensation increase		3.00	%	3.00	%	3.00	%		—		—		—

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates

A one percentage point change in the health care cost trend rates would have the following effects on our December 31, 2016 Consolidated Financial Statements:

(Dollars in thousands)	1% Increase		1% Decrease
Effect on total service cost plus interest cost	$	3	$	(3	)
Effect on accumulated postretirement benefit obligation	$	67	$	(64	)