Pension and Other Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Cost of Retirement Plan

The cost of the plan is disclosed below (in thousands):

	2016		2015		2014
Employee Investment Plan cost	$	4,976	$	5,072	$	4,816

Schedule of Percentage Range of Target Portfolio

At December 31, 2016, the percentage ranges of the target portfolio are:

Type of Investment	Percentage Range
Equity securities		63 to 67
Debt securities		33 to 37
Other		up to 1

Schedule of Assumptions Used

The rates are presented in the table below:

	December 31, 2016			December 31, 2015
Discount rate		4.50	%		4.50	%
Weighted-average rate of compensation increase		3.25	%		3.25	%
Asset return assumption		7.00	%		7.25	%

Schedule of Amounts Recognized in Balance Sheet and Income Statement

The following table sets forth the retirement plan, SERP, and PBOP funded statuses and amounts recognized on the Consolidated Balance Sheets and Consolidated Statements of Income.

	2016									2015
	Qualified Retirement Plan			SERP			PBOP			Qualified Retirement Plan			SERP			PBOP
(Thousands of dollars)
Change in benefit obligations
Benefit obligation for service rendered to date at beginning of year (PBO/PBO/APBO)	$	1,044,817		$	42,720		$	72,632		$	1,060,240		$	41,176		$	72,202
Service cost		22,833			331			1,499			25,123			320			1,641
Interest cost		46,027			1,859			3,180			44,229			1,695			2,999
Actuarial loss (gain)		8,550			1,347			(2,060	)		(44,553	)		2,322			(3,251	)
Benefits paid		(73,874	)		(2,946	)		(1,386	)		(40,222	)		(2,793	)		(959	)
Benefit obligation at end of year (PBO/PBO/APBO)		1,048,353			43,311			73,865			1,044,817			42,720			72,632
Change in plan assets
Market value of plan assets at beginning of year		736,880			—			43,584			754,796			—			44,892
Actual return on plan assets		39,956			—			4,818			(13,694	)		—			(1,034	)
Employer contributions		36,000			2,946			—			36,000			2,793			—
Benefits paid		(73,874	)		(2,946	)		(289	)		(40,222	)		(2,793	)		(274	)
Market value of plan assets at end of year		738,962			—			48,113			736,880			—			43,584
Funded status at year end	$	(309,391	)	$	(43,311	)	$	(25,752	)	$	(307,937	)	$	(42,720	)	$	(29,048	)
Weighted-average assumptions (benefit obligation)
Discount rate		4.50	%		4.50	%		4.50	%		4.50	%		4.50	%		4.50	%
Weighted-average rate of compensation increase		3.25	%		3.25	%		N/A			3.25	%		3.25	%		N/A

Schedule of Accumulated Benefit Obligation

The accumulated benefit obligation for the retirement plan and the SERP is presented below (in thousands):

	December 31, 2016		December 31, 2015
Retirement plan	$	939,002	$	922,992
SERP		40,852		39,270

Schedule of Expected Benefit Payments

Benefits expected to be paid for pension, SERP, and PBOP over the next 10 years are as follows (in millions):

	2017		2018		2019		2020		2021		2022-2026
Pension	$	48.6	$	50.1	$	51.5	$	53.2	$	55.1	$	294.2
SERP		2.9		2.9		2.9		2.9		2.9		14.4
PBOP		4.1		4.3		4.4		4.5		4.5		20.6

Schedule of Net Periodic Benefit Cost and Weighted-Average Assumptions

Components of net periodic benefit cost

	Qualified Retirement Plan									SERP									PBOP
	2016			2015			2014			2016			2015			2014			2016			2015			2014
(Thousands of dollars)
Service cost	$	22,833		$	25,123		$	21,360		$	331		$	320		$	292		$	1,499		$	1,641		$	1,101
Interest cost		46,027			44,229			43,440			1,859			1,695			1,745			3,180			2,999			2,829
Expected return on plan assets		(56,558	)		(57,808	)		(53,342	)		—			—			—			(3,149	)		(3,464	)		(3,264	)
Amortization of prior service cost		—			—			—			—			—			—			1,335			1,335			355
Amortization of net actuarial loss		25,266			32,743			22,873			1,383			1,293			783			417			345			—
Net periodic benefit cost	$	37,568		$	44,287		$	34,331		$	3,573		$	3,308		$	2,820		$	3,282		$	2,856		$	1,021
Weighted-average assumptions (net benefit cost)
Discount rate		4.50	%		4.25	%		5.00	%		4.50	%		4.25	%		5.00	%		4.50	%		4.25	%		5.00	%
Expected return on plan assets		7.25	%		7.75	%		7.75	%		N/A			N/A			N/A			7.25	%		7.75	%		7.75	%
Weighted-average rate of compensation increase		3.25	%		2.75	%		3.25	%		3.25	%		2.75	%		3.25	%		N/A			N/A			N/A

Schedule of Other Changes in Plan Assets and Benefit Obligations Recognized in Net Periodic Benefit Cost and Other Comprehensive Income

Other Changes in Plan Assets and Benefit Obligations Recognized in Net Periodic Benefit Cost and Other Comprehensive Income

	2016												2015												2014
	Total			Qualified Retirement Plan			SERP			PBOP			Total			Qualified Retirement Plan			SERP			PBOP			Total			Qualified Retirement Plan			SERP			PBOP
(Thousands of dollars)
Net actuarial loss (gain) (a)	$	22,770		$	25,153		$	1,347		$	(3,730	)	$	30,519		$	26,949		$	2,322		$	1,248		$	173,646		$	163,215		$	5,460		$	4,971
Amortization of prior service cost (b)		(1,335	)		—			—			(1,335	)		(1,335	)		—			—			(1,335	)		(355	)		—			—			(355	)
Amortization of net actuarial loss (b)		(27,066	)		(25,266	)		(1,383	)		(417	)		(34,381	)		(32,743	)		(1,293	)		(345	)		(23,656	)		(22,872	)		(784	)		—
Prior service cost		—			—			—			—			—			—			—			—			6,661			—			—			6,661
Regulatory adjustment		5,584			102			—			5,482			5,646			5,214			—			432			(140,308	)		(129,031	)		—			(11,277	)
Recognized in other comprehensive (income) loss		(47	)		(11	)		(36	)		—			449			(580	)		1,029			—			15,988			11,312			4,676			—
Net periodic benefit costs recognized in net income		44,423			37,568			3,573			3,282			50,451			44,287			3,308			2,856			38,172			34,331			2,820			1,021
Total of amount recognized in net periodic benefit cost and other comprehensive (income) loss	$	44,376		$	37,557		$	3,537		$	3,282		$	50,900		$	43,707		$	4,337		$	2,856		$	54,160		$	45,643		$	7,496		$	1,021

Schedule of Fair Value of Plan Assets

The following table sets forth, by level within the three-level fair value hierarchy, the fair values of the assets of the qualified pension plan and the PBOP as of December 31, 2016 and December 31, 2015. The change in the types of pension investment holdings between years is due to the engagement of Russell and the subsequent transition of pension investments to Russell funds. The transition efforts consolidated the majority of the pension plan investments into private commingled equity and fixed income funds. The SERP has no assets.

	December 31, 2016						December 31, 2015
	Qualified Retirement Plan		PBOP		Total		Qualified Retirement Plan			PBOP		Total
Assets at fair value (thousands of dollars):
Level 1 – Quoted prices in active markets for identical financial assets
Common stock
Agriculture	$	—	$	—	$	—	$	7,021		$	209	$	7,230
Capital equipment		—		—		—		533			16		549
Chemicals/materials		—		—		—		3,304			98		3,402
Consumer goods		—		—		—		41,035			1,221		42,256
Energy and mining		—		—		—		11,066			329		11,395
Finance/insurance		—		—		—		29,957			892		30,849
Healthcare		—		—		—		37,930			1,129		39,059
Information technology		—		—		—		29,229			870		30,099
Services		—		—		—		12,341			367		12,708
Telecommunications/internet/media		—		—		—		25,883			770		26,653
Other		—		—		—		9,043			269		9,312
Real estate investment trusts		—		—		—		5,010			149		5,159
Mutual funds		—		24,922		24,922		87,483			23,985		111,468
Government fixed income securities		—		—		—		33,482			996		34,478
Futures contracts		—		—		—		(7	)		—		(7	)
Total Level 1 Assets (1)	$	—	$	24,922	$	24,922	$	333,310		$	31,300	$	364,610
Level 2 – Significant other observable inputs
Private commingled equity funds (2)
International	$	290,668	$	9,140	$	299,808	$	—		$	—	$	—
Large and medium capitalization		121,434		3,819		125,253		—			—		—
Small capitalization		25,947		816		26,763		—			—		—
Emerging markets		45,309		1,424		46,733		—			—		—
Private commingled fixed income funds (3)
U.S. corporate bonds		161,086		5,066		166,152		—			—		—
U.S. debt market long duration		77,349		2,432		79,781		—			—		—
U.S. Treasury securities		8,665		272		8,937		—			—		—
Pooled funds and mutual funds		4,889		216		5,105		14,808			796		15,604
Government fixed income and mortgage backed securities		167		5		172		49,571			1,475		51,046
Corporate fixed income securities
Asset-backed and mortgage-backed		—		—		—		23,542			701		24,243
Banking		—		—		—		20,857			621		21,478
Insurance		—		—		—		4,896			146		5,042
Utilities		—		—		—		3,826			114		3,940
Other		—		—		—		30,995			922		31,917
Real estate investment trusts		—		—		—		1,949			58		2,007
State and local obligations		—		—		—		950			28		978
Preferred securities		—		—		—		554			17		571
Convertible securities		—		—		—		196			6		202
Total Level 2 assets (4)	$	735,514	$	23,190	$	758,704	$	152,144		$	4,884	$	157,028
Total Plan assets at fair value	$	735,514	$	48,112	$	783,626	$	485,454		$	36,184	$	521,638
Commingled equity funds (5)		—		—		—		250,511			7,455		257,966
Insurance company general account contracts (6)		3,448		—		3,448		3,719			—		3,719
Total Plan assets (7)	$	738,962	$	48,112	$	787,074	$	739,684		$	43,639	$	783,323

(1) The Mutual funds category above is an intermediate-term bond fund whose manager employs multiple concurrent strategies and takes only moderate risk in each, thereby reducing the risk of poor performance arising from any single source, and a balanced fund that invests in a diversified portfolio of common stocks, preferred stocks and fixed-income securities. Strategies utilized by the bond fund include duration management, yield curve or maturity structuring, sector rotation, and all bottom-up techniques including in-house credit and quantitative research. Strategies employed by the fund include pursuit of regular income, conservation of principal, and an opportunity for long-term growth of principal and income. Currently, this balanced fund is the only mutual fund in which the Plan invests.

In the prior year, Level 1 also included Common stock, Real Estate Investment Trusts, Mutual funds, and U.S. Government securities listed or regularly traded on a national securities exchange and were valued at quoted market prices as of the last business day of the calendar year.

(2) The private commingled equity funds include common collective trusts that invest in a diversified portfolio of domestic and international securities regularly traded on securities exchanges. These funds are shown in the above table at net asset value (“NAV”), which is the value of securities in the fund less the amount of any liabilities outstanding. Investment strategies employed by the funds include:

• Domestic equities

• International developed countries equities

• Emerging markets equities

Shares in the private equity commingled funds may be redeemed given one business day notice. While they are private equity funds and reported at NAV, due to the short redemption notice period, the lack of significant redemption fees, the fact that the underlying investments are exchange-traded, and that substantial liabilities do not exist subject to the NAV calculation, these investments are viewed as indirectly observable (level 2) and are also therefore, not excluded from the body of the fair value table as a reconciling item.

Two funds are classified as international funds. One invests in international financial markets, primarily those of developed economies in Europe and the Pacific Basin. The fund invests primarily in equity securities issued by foreign corporations, but may invest in other securities perceived as offering attractive investment return opportunities. The other provides diversified exposure to global equity markets. The fund seeks to provide long-term capital growth by investing primarily in securities listed on the major developed equity markets of the United States, Europe, and Asia, as well as within those listed on emerging country equity markets on a tactical basis.

The large and medium capitalization fund is designed to track the performance of the large and medium capitalization companies contained in the index, which represents approximately 90% of the market capitalization of the United States stock market.

The small capitalization fund is designed to provide maximum long-term appreciation through investments that are well diversified by industry.

The emerging markets fund was developed to invest in emerging market equities worldwide. The purposes of the fund’s operations, “emerging market countries” include every country in the world except the developed markets of the United States, Canada, Japan, Australia, New Zealand, Hong Kong and Singapore, and most countries located in Western Europe. Fund investments are made directly in each country or, where direct investment is inefficient or prohibited, through appropriate financial instruments or participation in commingled funds.

(3) The private commingled fixed income funds include domestic fixed income securities. These funds are shown in the above table at NAV. Shares in the private commingled fixed equity funds may be redeemed given one business day notice. While they are private equity funds and reported at NAV, due to the short redemption notice period, the lack of significant redemption fees, the fact that the underlying investments are exchange-traded, and that substantial liabilities do not exist subject to the NAV calculation, these investments are viewed as indirectly observable (level 2) and are also therefore, not excluded from the body of the fair value table as a reconciling item.

The U.S. corporate bond fund seeks to provide high quality, mostly corporate bond-based exposure to fixed income securities which closely match those found in discount curves used to value United States pension liabilities.

The United States debt market long duration fund provides participation in the full spectrum of investment opportunities in primarily United States debt markets with longer maturities. The fund seeks to offer effective diversification against equities, take advantage of market trading opportunities, and provide a competitive rate of return on assets. The fund’s current duration is close to 14 years.

The United States Treasuries securities funds seeks to replicate the risk and return characteristics of the Barclays Treasury U.S. Separate Trading of Registered Interest and Principal of Securities (“STRIPS”) 28-29 Years Index with minimum tracking error.

(4) With the exception of items (2) and (3), which are discussed in detail above, the current year Level 2 assets consist mainly of pooled funds and mutual funds. These funds are collective short-term funds that invest in Treasury bills and money market funds and are used as a temporary cash repository.

In the prior year, the fair value of the Level 2 investments in debt securities with remaining maturities of one year or more was determined by dealers who make markets in such securities or by an independent pricing service, which considers yield or price of bonds of comparable quality, coupon, maturity, and type.

(5) In the prior year, the commingled equity funds included private equity funds that invest in domestic and international securities regularly traded on securities exchanges. These funds are shown in the above table at net asset value, which is the value of securities in the fund less the amount of any liabilities outstanding. Investment strategies employed by the funds included:

• Domestic large capitalization value equities

• International developed countries value and growth equities

• Emerging markets equities

• International small capitalization equities

The terms and conditions under which shares in the commingled equity funds were redeemed varied among the funds; the notice required ranged from one day to 30 days prior to the valuation date (month end). One of the commingled equity funds required the payment of a minimal impact fee to be applied to redemptions and subscriptions of $5 million or greater; the relative fee diminished the greater the transaction. Other such funds imposed fees to recover direct costs incurred by the fund at redemption, but were indeterminable prior to redemption.

(6) The insurance company general account contracts are annuity insurance contracts used to pay the pensions of employees who retired prior to 1989. The balance of the account disclosed in the above table is the contract value, which is the result of deposits, withdrawals, and interest credits.

(7) In the prior year, the assets in the above table exceeded the market value of plan assets shown in the funded status table by $2,859,000 (qualified retirement plan – $2,803,000, PBOP – $56,000), which includes a payable for securities purchased, partially offset by receivables for interest, dividends, and securities sold.