Pension Plan and Postretirement Benefits Other Than Pension (Tables)

6 Months Ended

Jun. 30, 2015

Pension Plan and Postretirement Benefits Other Than Pension

Schedule of components of net periodic pension and other postretirement costs

	Pension Benefits					Other Postretirement Benefits			Pension Benefits				Other Postretirement Benefits
	Three months ended June 30,					Three months ended June 30,			Six months ended June 30,				Six months ended June 30,
	2015			2014		2015	2014		2015		2014		2015	2014
	(in thousands)								(in thousands)
Components of net periodic benefit cost:
Service cost	$	2,994		2,317		228	180		6,041		5,042		456	360
Interest cost	2,056			2,045		99	99		4,210		4,198		198	198
Expected return on plan assets	(3,565		)	(3,595	)	—	—		(7,256	)	(7,008	)	—	—
Actuarial (gain) loss amortization	1,209			337		—	(4	)	2,585		748		—	(8	)
Prior service cost amortization	115			104		5	14		230		234		10	28
Transition obligation amortization	1			1		—	—		2		2		—	—
Total(1)	$	2,810		1,209		332	289		5,812		3,216		664	578

(1) Approximately 60% of net periodic pension and other postretirement benefit costs are included in compensation and related costs on the consolidated statements of income, while the remainder is included in underwriting and distribution expense.