Pensions and Other Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2017

Pensions and Other Employee Benefit Plans [Abstract]

Components of Net Periodic Cost

The following tables provide the components of net periodic cost included in general and administrative expenses for our qualified retirement plan (the “Pension Benefits”) and health care and life insurance benefits for retired employees and dependents (the “Other Benefits”) for the three and six months ended June 30, 2017and 2016 (in thousands):

	Pension Benefits				Other Benefits
	Three Months Ended June 30,				Three Months Ended June 30,
	2017		2016		2017		2016
Service cost	$	178	$	192	$	1	$	1
Interest cost		494		501		4		5
Expected return on plan assets		(530)		(511)		—		—
Amortization of net actuarial loss		267		248		1		2
Amortization of prior service credits		—		—		6		5
Net periodic cost	$	409	$	430	$	12	$	13

	Pension Benefits				Other Benefits
	Six Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Service cost	$	351	$	334	$	1	$	1
Interest cost		980		991		9		10
Expected return on plan assets		(1,062)		(1,023)		—		—
Amortization of net actuarial loss		499		444		2		3
Amortization of prior service credits		—		—		12		11
Net periodic cost	$	768	$	746	$	24	$	25