Retirement Plan (Tables)

12 Months Ended

Dec. 31, 2015

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan

The following table sets forth the changes in the benefit obligation and plan assets of our post-retirement healthcare plans for the years ended December 31, 2015 and 2014:

	Years Ended December 31,
	2015			2014
	(In thousands)
Change in plans' benefit obligation
Post-retirement plans' benefit obligation - beginning of year	$	23,633		$	15,715
Service cost	1,694			895
Interest cost	819			638
Participant contributions	593			573
Amendments	—			3,383
Benefits paid	(2,260		)	(1,533		)
Actuarial loss (gain)	(3,278		)	3,962
Post-retirement plans' benefit obligation - end of year	$	21,201		$	23,633
Change in plan assets
Fair value of plan assets - beginning of year	$	—		$	—
Employer contributions	1,667			960
Participant contributions	593			573
Benefits paid	(2,260		)	(1,533		)
Fair value of plan assets - end of year	$	—		$	—
Funded status
Under-funded balance	$	(21,201	)	$	(23,633	)
Amounts recognized in consolidated balance sheets
Accrued post-retirement liability	$	(21,201	)	$	(23,633	)
Amounts recognized in accumulated other comprehensive income (loss)
Cumulative actuarial loss	$	(1,613	)	$	(5,074	)
Prior service credit	35,937			39,419
Total	$	34,324		$	34,345

Weighted Average Assumptions Used

The weighted average assumptions used to determine end of period benefit obligations:

	December 31,
	2015		2014
Discount rate	3.90	%	3.60	%
Current health care trend rate	8.00	%	8.00	%
Ultimate health care trend rate	5.00	%	5.00	%
Year rate reaches ultimate trend rate	2041		2042

Net Periodic Pension Expense

Net periodic post-retirement credit consisted of the following components:

	Years Ended December 31,
	2015			2014			2013
	(In thousands)
Service cost – benefit earned during the year	$	1,694		$	895		$	1,112
Interest cost on projected benefit obligations	819			638			665
Amortization of prior service credit	(3,482		)	(4,296		)	(5,896		)
Amortization of net loss	183			—			130
Loss on settlement	—			—			1,726
Net periodic post-retirement credit	$	(786	)	$	(2,763	)	$	(2,263	)

Weighted Average Assumptions Used to Health Care Cost Trend Rates

Assumed health care cost trend rates have an effect on the amounts reported for the post-retirement health care benefit plans. The weighted average assumptions used to determine net periodic benefit expense follow:

	Years Ended December 31,
	2015		2014		2013
Discount rate	3.60	%	4.25	%	3.45	%
Current health care trend rate	8.00	%	8.00	%	8.10	%
Ultimate health care trend rate	5.00	%	5.00	%	5.00	%
Year rate reaches ultimate trend rate	2042		2045		2023

Effect of One Percent Change in Health Care Cost Trend Rates

The effect of a 1% change in health care cost trend rates is as follows:

	1% Point Increase		1% Point Decrease
	(In thousands)
Service cost	$	268	$	(222	)
Interest cost	$	68	$	(58	)
Year-end accumulated post-retirement benefit obligation	$	1,443	$	(1,254	)