Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2016

Defined Benefit Plan Disclosure [Line Items]

Schedule of Amount Recognized in Accumulated Other Comprehensive Income (Loss)

Changes in Accumulated Other Comprehensive Income (Loss) (net of tax) by component are presented below (in thousands):
		Unrecognized Pension and Post-retirement Benefit Costs			Net Unrealized Gains (Losses) on Marketable Securities			Net Losses on Cash Flow Hedges			Accumulated Other Comprehensive Income (Loss)
Balance at December 31, 2013		$	(21,330	)	$	36,240		$	(12,298	)	$	2,612
	Other comprehensive income (loss) before reclassifications	(12,628		)	8,694			—			(3,934		)
	Amounts reclassified from accumulated other comprehensive income (loss)	(926		)	(5,977		)	224			(6,679		)
Balance at December 31, 2014		(34,884		)	38,957			(12,074		)	(8,001		)
	Other comprehensive income (loss) before reclassifications	3,777			(2,255		)	—			1,522
	Amounts reclassified from accumulated other comprehensive income (loss)	1,238			(8,937		)	264			(7,435		)
Balance at December 31, 2015		(29,869		)	27,765			(11,810		)	(13,914		)
	Other comprehensive income before reclassifications	7,363			6,904			—			14,267
	Amounts reclassified from accumulated other comprehensive income (loss)	(1,422		)	(6,206		)	159			(7,469		)
Balance at December 31, 2016		$	(23,928	)	$	28,463		$	(11,651	)	$	(7,116	)

Retirement Income Plan

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Funded Status

The obligations and funded status of the plans are presented below (in thousands):

	December 31,
	2016						2015
	Retirement Income Plan			Non-Qualified Retirement Plans			Retirement Income Plan			Non-Qualified Retirement Plans
Change in projected benefit obligation:
Benefit obligation at end of prior year	$	325,706		$	26,958		$	341,133		$	28,397
Service cost	7,705			296			8,530			262
Interest cost	12,161			878			13,477			1,018
Actuarial (gain) loss	7,988			1,267			(19,290		)	(810		)
Benefits paid	(15,792		)	(1,937		)	(18,144		)	(1,909		)
Benefit obligation at end of year	337,768			27,462			325,706			26,958
Change in plan assets:
Fair value of plan assets at end of prior year	260,035			—			272,939			—
Actual return (loss) on plan assets	18,223			—			(3,760		)	—
Employer contribution	7,300			1,937			9,000			1,909
Benefits paid	(15,792		)	(1,937		)	(18,144		)	(1,909		)
Fair value of plan assets at end of year	269,766			—			260,035			—
Funded status at end of year	$	(68,002	)	$	(27,462	)	$	(65,671	)	$	(26,958	)

Schedule of Amounts Recognized in Balance Sheet

Amounts recognized in the Company's balance sheets consist of the following (in thousands):

	December 31,
	2016						2015
	Retirement Income Plan			Non-Qualified Retirement Plans			Retirement Income Plan			Non-Qualified Retirement Plans
Current liabilities	$	—		$	(2,696	)	$	—		$	(2,102	)
Noncurrent liabilities	(68,002		)	(24,766		)	(65,671		)	(24,856		)
Total	$	(68,002	)	$	(27,462	)	$	(65,671	)	$	(26,958	)

Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets

The accumulated benefit obligation in excess of plan assets is as follows (in thousands):    

	December 31,
	2016						2015
	Retirement Income Plan			Non-Qualified Retirement Plans			Retirement Income Plan			Non-Qualified Retirement Plans
Projected benefit obligation	$	(337,768	)	$	(27,462	)	$	(325,706	)	$	(26,958	)
Accumulated benefit obligation	(314,071		)	(25,550		)	(302,446		)	(25,785		)
Fair value of plan assets	269,766			—			260,035			—

Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Loss)

Pre-tax amounts recognized in accumulated other comprehensive income consist of the following (in thousands):    

	Years Ended December 31,
	2016						2015
	Retirement Income Plan			Non-Qualified Retirement Plans			Retirement Income Plan			Non-Qualified Retirement Plans
Net loss	$	121,052		$	10,073		$	118,963		$	9,592
Prior service benefit	(23,877		)	(185		)	(27,344		)	(224		)
Total	$	97,175		$	9,888		$	91,619		$	9,368

Schedule of Net Periodic Benefit Costs

The components of net periodic benefit cost are presented below (in thousands):

	Years Ended December 31,
	2016						2015						2014
	Retirement Income Plan			Non-Qualified Retirement Plans			Retirement Income Plan			Non-Qualified Retirement Plans			Retirement Income Plan			Non-Qualified Retirement Plans
Service cost	$	7,705		$	296		$	8,530		$	262		$	8,284		$	303
Interest cost	12,161			878			13,477			1,018			14,001			1,041
Expected return on plan assets	(18,879		)	—			(19,795		)	—			(18,699		)	—
Amortization of:
Net loss	6,554			785			9,710			937			8,178			675
Prior service benefit	(3,467		)	(39		)	(3,467		)	(39		)	(2,889		)	(17		)
Net periodic benefit cost	$	4,074		$	1,920		$	8,455		$	2,178		$	8,875		$	2,002

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)

The changes in benefit obligations recognized in other comprehensive income are presented below (in thousands):

	Years Ended December 31,
	2016						2015						2014
	Retirement Income Plan			Non-Qualified Retirement Plans			Retirement Income Plan			Non-Qualified Retirement Plans			Retirement Income Plan			Non-Qualified Retirement Plans
Net (gain) loss	$	8,644		$	1,266		$	4,266		$	(811	)	$	47,324		$	3,508
Prior service benefit	—			—			—			—			(33,700		)	(500		)
Amortization of:
Net loss	(6,554		)	(785		)	(9,710		)	(937		)	(8,178		)	(675		)
Prior service benefit	3,467			39			3,467			39			2,889			17
Total recognized in other comprehensive income	$	5,557		$	520		$	(1,977	)	$	(1,709	)	$	8,335		$	2,350

Schedule of Recognized Net Periodic Benefit Obligation and Other Comprehensive Income

The total amount recognized in net periodic benefit costs and other comprehensive income are presented below (in thousands):

	Years Ended December 31,
	2016				2015				2014
	Retirement Income Plan		Non-Qualified Retirement Plans		Retirement Income Plan		Non-Qualified Retirement Plans		Retirement Income Plan		Non-Qualified Retirement Plans
Total recognized in net periodic benefit cost and other comprehensive income	$	9,631	$	2,440	$	6,478	$	469	$	17,210	$	4,352

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year

The following are amounts in accumulated other comprehensive income that are expected to be recognized as components of net periodic benefit cost during 2017 (in thousands):

	Retirement Income Plan			Non-Qualified Retirement Plans
Net loss	$	7,530		$	825
Prior service benefit	(3,470		)	(40		)

Schedule of Allocation of Plan Assets

The Company’s target allocations for the plan’s assets are presented below:

	December 31, 2016
Equity securities	50	%
Fixed income	40	%
Alternative investments	10	%
Total	100	%

Fair Value, Measurement Inputs, Disclosure

The fair value of the Company’s Retirement Plan assets at December 31, 2016 and 2015, and the level within the three levels of the fair value hierarchy defined by the FASB guidance on fair value measurements are presented in the table below (in thousands):

Description of Securities	Fair Value as of December 31, 2016		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and Cash Equivalents	$	932	$	932	$	—	$	—
Common Collective Trusts (a)
Equity funds	144,081		144,081		—		—
Fixed income funds	109,356		109,356		—		—
Real Estate Funds	8,406		8,406		—		—
Total Common Collective Trusts	261,843		261,843		—		—
Limited Partnership Interest in Real Estate (b)(c)	6,991
Total Plan Investments	$	269,766	$	262,775	$	—	$	—

Description of Securities	Fair Value as of December 31, 2015		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and Cash Equivalents	$	1,266	$	1,266	$	—	$	—
Common Collective Trusts (a)
Equity funds	144,279		144,279		—		—
Fixed income funds	103,877		103,877		—		—
Real Estate Funds	2,025		2,025		—		—
Total Common Collective Trusts	250,181		250,181		—		—
Limited Partnership Interest in Real Estate (b)(c)	8,588
Total Plan Investments	$	260,035	$	251,447	$	—	$	—

 _____________________

(a) The Common Collective Trusts are invested in equity and fixed income securities, or a combination thereof. The investment objective of each fund is to produce returns in excess of, or commensurate with, its predefined index.

(b) This investment is a commercial real estate partnership that purchases land, develops limited infrastructure, and sells it for commercial development. The Company was restricted from selling its partnership interest during the life of the partnership, which spanned 7 years. Return on investment is realized as land is sold. The fair value of the limited partnership interest in real estate is based on the NAV of the partnership which reflects the appraised value of the land. The partnership term expired on June 30, 2016. Upon expiration, dissolution of the partnership commenced and, as a result, the general partner of the partnership is attempting to sell the remaining inventory as soon as possible at the highest pricing possible.

(c) In the first quarter of 2016, the Company implemented ASU 2015-07, Fair Value Measurement (Topic 820) which eliminates the requirement to categorize investments in the fair value hierarchy if the fair value is measured at NAV per share (or its equivalent) using the practical expedient in the FASB’s fair value measurement guidance. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position. ASU 2015-07 is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years.

Changes in Fair Value of Investments in Real Estate

The table below reflects the changes in the fair value of investments in the real estate limited partnership during the period (in thousands):

	Fair Value of Investments in Real Estate
Balances at December 31, 2014	$	8,748
Unrealized loss in fair value	(160		)
Balances at December 31, 2015	8,588
Sale of land	(775		)
Unrealized loss in fair value	(822		)
Balances at December 31, 2016	$	6,991

Schedule of Expected Benefit Payments

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid (in thousands):

	Retirement Income Plan		Non-Qualified Retirement Plans
2017	$	16,113	$	2,698
2018	19,080		2,060
2019	18,771		2,025
2020	18,923		1,957
2021	19,755		1,907
2022-2026	107,916		8,949

Retirement Income Plan | Benefit Obligations

Defined Benefit Plan Disclosure [Line Items]

Schedule of Assumptions Used

The following are the weighted-average actuarial assumptions used to determine the benefit obligations:

	December 31,
	2016						2015
			Non-Qualified						Non-Qualified
	Retirement Income Plan		Supplemental Retirement Plan		Excess Benefit Plan		Retirement Income Plan		Supplemental Retirement Plan		Excess Benefit Plan
Discount rate	4.29	%	3.76	%	4.34	%	4.57	%	3.99	%	4.59	%
Rate of compensation increase	4.5	%	N/A		4.5	%	4.5	%	N/A		4.5	%

Retirement Income Plan | Net Periodic Benefit Costs

Defined Benefit Plan Disclosure [Line Items]

Schedule of Assumptions Used

The following are the weighted-average actuarial assumptions used to determine the net periodic benefit cost for the twelve months endedDecember 31:

	2016						2015						2014 (a)
			Non-Qualified						Non-Qualified						Non-Qualified
	Retirement Income Plan		Supplemental Retirement Plan		Excess Benefit Plan		Retirement Income Plan		Supplemental Retirement Plan		Excess Benefit Plan		Retirement Income Plan		Supplemental Retirement Plan		Excess Benefit Plan
Discount rate
Benefit     obligation	4.57	%	3.99	%	4.63	%	4.0	%	3.4	%	4.1	%	4.9	%	3.9	%	4.9	%
Service cost	4.83	%	N/A		4.87	%	4.0	%	N/A		4.1	%	4.9	%	N/A		4.9	%
Interest cost	3.86	%	3.04	%	3.9	%	4.0	%	3.4	%	4.1	%	4.9	%	3.9	%	4.9	%
Expected long-term return on plan assets	7.0	%	N/A		N/A		7.5	%	N/A		N/A		7.5	%	N/A		N/A
Rate of compensation increase	4.5	%	N/A		4.5	%	4.5	%	N/A		4.5	%	4.75	%	N/A		4.75	%

 _____________________

(a) The Retirement Plan and the Excess Benefit Plan were remeasured on February 28, 2014 due to the above mentioned plan amendment. The discount rate used to remeasure the benefit obligation was 4.6% for the Retirement Plan and 4.5% for the Excess Benefit Plan, compared to 4.9% for both plans as of January 1, 2014. All other assumptions remained consistent with assumptions used at January 1, 2014.

Other Postretirement Benefit Plan

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Funded Status

The following table contains a reconciliation of the change in the benefit obligation, the fair value of plan assets, and the funded status of the plan (in thousands):

	December 31,
	2016			2015
Change in benefit obligation:
Benefit obligation at end of prior year	$	92,643		$	100,700
Service cost	2,769			3,454
Interest cost	3,167			4,035
Actuarial loss (gain)	10,751			(11,423		)
Amendment (a) (b)	(32,697		)	(824		)
Benefits paid	(4,428		)	(4,544		)
Retiree contributions	1,310			1,245
Benefit obligation at end of year	73,515			92,643
Change in plan assets:
Fair value of plan assets at end of prior year	38,090			41,358
Actual return (loss) on plan assets	2,443			(469		)
Employer contribution	1,700			500
Benefits paid	(4,428		)	(4,544		)
Retiree contributions	1,310			1,245
Fair value of plan assets at end of year	39,115			38,090
Funded status at end of year	$	(34,400	)	$	(54,553	)

_____________________

(a) During October 2016, the Company approved and communicated a plan amendment that resulted in a remeasurement of the Company's Other Post-retirement Benefit Plan. Effective January 1, 2017, retirees and dependents that are less than 65 years of age are offered a choice between a $1,000 and $2,250 deductible plan. Additionally, retirees and dependents that are 65 years of age or greater were covered by a fully insured Medicare advantage plan.

(b) Amendment relates to modification of the Company's Other Post-retirement Benefit Plan which increased mail order co-payments for post age 65. The amendment was approved in 2015 and became effective January 1, 2016.

Schedule of Amounts Recognized in Balance Sheet

Amounts recognized in the Company's balance sheets consist of the following (in thousands):

	December 31,
	2016			2015
Current liabilities	$	—		$	—
Noncurrent liabilities	(34,400		)	(54,553		)
Total	$	(34,400	)	$	(54,553	)

Schedule of Amount Recognized in Accumulated Other Comprehensive Income (Loss)

Pre-tax amounts recognized in accumulated other comprehensive income consist of the following (in thousands):

	December 31,
	2016			2015
Net gain	$	(26,285	)	$	(38,802	)
Prior service benefit	(41,009		)	(12,213		)
Total	$	(67,294	)	$	(51,015	)

Schedule of Net Periodic Benefit Costs

Net periodic benefit cost is made up of the components listed below (in thousands):

	Years Ended December 31,
	2016			2015			2014
Service cost	$	2,769		$	3,454		$	2,845
Interest cost	3,167			4,035			4,463
Expected return on plan assets	(1,835		)	(2,070		)	(2,116		)
Amortization of:
Prior service benefit	(3,901		)	(3,068		)	(4,753		)
Net gain	(2,374		)	(2,025		)	(2,671		)
Net periodic benefit cost	$	(2,174	)	$	326		$	(2,232	)

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)

The changes in benefit obligations recognized in other comprehensive income are presented below (in thousands):

	Years Ended December 31,
	2016			2015			2014
Net (gain) loss	$	10,143		$	(8,884	)	$	3,496
Prior service benefit	(32,697		)	(824		)	—
Amortization of:
Prior service benefit	3,901			3,068			4,753
Net gain	2,374			2,025			2,671
Total recognized in other comprehensive income	$	(16,279	)	$	(4,615	)	$	10,920

Schedule of Recognized Net Periodic Benefit Obligation and Other Comprehensive Income

The total amount recognized in net periodic benefit cost and other comprehensive income are presented below (in thousands):

	Years Ended December 31,
	2016			2015			2014
Total recognized in net periodic benefit cost and other comprehensive income	$	(18,453	)	$	(4,289	)	$	8,688

Schedule of Allocation of Plan Assets

The Company’s target allocations for the plan’s assets are presented below:

	December 31, 2016
Equity securities	65	%
Fixed income	30	%
Alternative investments	5	%
Total	100	%

Fair Value, Measurement Inputs, Disclosure

The fair value of the Company’s Other Post-retirement Benefits Plan assets at December 31, 2016 and 2015, and the level within the three levels of the fair value hierarchy defined by the FASB guidance on fair value measurements are presented in the table below (in thousands):

Description of Securities	Fair Value as of December 31, 2016		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Institutional Funds (a)
Equity funds	$	26,133	$	26,133	$	—	$	—
Fixed income funds	11,671		11,671		—		—
Total Institutional Funds	37,804		37,804		—		—
Limited Partnership Interest in Real Estate (b) (c)	1,311
Total Plan Investments	$	39,115	$	37,804	$	—	$	—
Description of Securities	Fair Value as of December 31, 2015		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Institutional Funds (a)
Equity funds	$	24,881	$	24,881	$	—	$	—
Fixed income funds	11,599		11,599		—		—
Total Institutional Funds	36,480		36,480		—		—
Limited Partnership Interest in Real Estate (b) (c)	1,610
Total Plan Investments	$	38,090	$	36,480	$	—	$	—

 ___________________

(a) The institutional funds are invested in equity or fixed income securities, or a combination thereof. The investment objective of each fund is to produce returns in excess of, or commensurate with, its predefined index.

(b) This investment is a commercial real estate partnership that purchases land, develops limited infrastructure, and sells it for commercial development. The Company was restricted from selling its partnership interest during the life of the partnership, which spanned 7 years. Return of investment is realized as land is sold. The fair value of the limited partnership interest in real estate is based on the NAV of the partnership which reflects the appraised value of the land. The partnership term expired on June 30, 2016. Upon expiration, dissolution of the partnership commenced and, as a result, the general partner of the partnership is attempting to sell the remaining inventory as soon as possible at the highest pricing possible.

(c) In the first quarter of 2016, the Company implemented ASU 2015-07, Fair Value Measurement (Topic 820) which eliminates the requirement to categorize investments in the fair value hierarchy if the fair value is measured at NAV per share (or its equivalent) using the practical expedient in the FASB’s fair value measurement guidance. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position. ASU 2015-07 is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years.

Changes in Fair Value of Investments in Real Estate

The table below reflects the changes in the fair value of the investments in real estate during the period (in thousands):

	Fair Value of Investments  in Real Estate
Balance at December 31, 2014	$	1,640
Unrealized loss in fair value	(30		)
Balance at December 31, 2015	1,610
Sale of land	(145		)
Unrealized loss in fair value	(154		)
Balance at December 31, 2016	$	1,311

Schedule of Expected Benefit Payments

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid (in thousands):

2017	$	2,622
2018	2,880
2019	3,057
2020	3,320
2021	3,510
2022-2026	20,084

Other Postretirement Benefit Plan | Accrued Postretirement Benefit

Defined Benefit Plan Disclosure [Line Items]

Schedule of Assumptions Used

The following are the weighted-average actuarial assumptions used to determine the accrued post-retirement benefit obligations:

	December 31,
	2016		2015
Discount rate at end of year	4.36	%	4.59	%
Health care cost trend rates:
Initial
Pre-65 medical	6.50	%	7.00	%
Post-65 medical	4.50	%	7.00	%
Pre-65 drug	7.50	%	7.00	%
Post-65 drug	10.50	%	7.00	%
Ultimate	4.50	%	4.50	%
Year ultimate reached (a)	2026		2026

_____________________ (a) Pre-65 medical reaches the ultimate trend rate in 2025. Additionally, the Post-65 medical trend is assumed to be 4.50% for all years into the future.

Other Postretirement Benefit Plan | Net Periodic Benefit Costs

Defined Benefit Plan Disclosure [Line Items]

Schedule of Assumptions Used

The following are the weighted-average actuarial assumptions used to determine the net periodic benefit cost for the twelve months endedDecember 31:

	2016 (a)				2015		2014
Discount rate:	January 1 - September 30		October 1 - December 31
Benefit obligation	4.59	%	3.75	%	4.1	%	4.9	%
Service cost	4.91	%	4.03	%	4.1	%	4.9	%
Interest cost	3.86	%	3.15	%	4.1	%	4.9	%
Expected long-term return on plan assets	4.875%				5.2	%	5.2	%
Health care cost trend rates:
Initial	7.00%				7.25	%	7.5	%
Ultimate	4.5%				4.5	%	4.5	%
Year ultimate reached	2026				2026		2026

_____________________

(a) The actuarial assumptions are evaluated by the Company at each measurement date. The Other Post-retirement Benefits Plan was remeasured at October 1, 2016 due to a plan amendment.