Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2020

Compensation Related Costs [Abstract]

Schedule of Net Periodic Benefit Cost

The following table details the components of the net periodic (benefit) expense for pension obligations:

	Three Months Ended March 31,
	2020			2019
Interest cost	$	4,735		$	6,616
Expected return on plan assets	(6,812		)	(7,006		)
Amortization of net actuarial loss	469			208
Settlement	1,167			—
Net periodic benefit	$	(441	)	$	(182	)

The following table details the components of the net periodic (benefit) expense for black lung obligations:

	Three Months Ended March 31,
	2020			2019
Service cost	$	579		$	404
Interest cost	898			910
Expected return on plan assets	(13		)	(16		)
Amortization of net actuarial loss	331			45
Net periodic expense	$	1,795		$	1,343

The following table details the components of the net periodic (benefit) expense for life insurance benefit obligations:

	Three Months Ended March 31,
	2020			2019
Interest cost	$	84		$	106
Amortization of net actuarial gain	(12		)	(26		)
Net periodic expense	$	72		$	80