EMPLOYEE BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2019

Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]

Components of the Net Periodic Benefit Cost

Components of the net periodic benefit cost of PLC’s defined benefit pension plan for the three months ended March 31, 2019 and 2018, are as follows: 

	For The Three Months Ended March 31,
	2019					2018
	Qualified Pension Plan			Nonqualified Excess Pension Plan		Qualified Pension Plan			Nonqualified Excess Pension Plan
	(Dollars In Thousands)
Service cost — benefits earned during the period	$	3,114		$	285	$	3,441		$	387
Interest cost on projected benefit obligation	2,778			371		2,397			359
Expected return on plan assets	(4,463		)	—		(4,026		)	—
Amortization of prior service cost	—					—			—
Amortization of actuarial loss	—			74		—			265
Total net periodic benefit costs	$	1,429		$	730	$	1,812		$	1,011