Fair value measurement (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Financial Instruments Measured at Fair Value

The financial instruments measured at fair value in the accompanying Consolidated Balance Sheets consist of the following:

Company Owned Assets
In thousands of dollars
Fair value measurement as of Dec. 31, 2016
	Level 1		Level 2		Level 3		Total
Assets:
Deferred compensation investments	$	28,558	$	—	$	—	$	28,558
Available for sale investment	16,744		—		—		16,744
Total	$	45,302	$	—	$	—	$	45,302
Deferred compensation investments valued using net asset value as a practical expedient:
Interest in registered investment companies							$	10,140
Fixed income fund							13,575
Total investments at fair value							$	69,017

In thousands of dollars
Fair value measurement as of Dec. 31, 2015
	Level 1		Level 2		Level 3		Total
Assets:
Deferred compensation investments	$	27,770	$	—	$	—	$	27,770
Available for sale investment	28,090		—		—		28,090
Total	$	55,860	$	—	$	—	$	55,860
Deferred compensation investments valued using net asset value as a practical expedient:
Interest in registered investment companies							$	36,114
Fixed income fund							13,315
Total investments at fair value							$	105,289

Fair Value of Pension Plan Assets by Level within Fair Value Hierarchy

Pension Plan Assets
In thousands of dollars
Fair value measurement as of Dec. 31, 2016
	Level 1		Level 2		Level 3		Total
Assets:
Cash and other	$	2,206	$	—	$	—	$	2,206
Corporate stock	60,730		—		—		60,730
Total	$	62,936	$	—	$	—	$	62,936
Pension plan investments valued using net asset value as a practical expedient:
Common collective trust - equities							$	167,647
Common collective trust - fixed income							127,043
Hedge funds							14,754
Partnership/joint venture interests							8,985
Interest in registered investment companies							6,803
Total fair value of plan assets							$	388,168

In thousands of dollars
Fair value measurement as of Dec. 31, 2015
	Level 1		Level 2		Level 3		Total
Assets:
Cash and other	$	1,098	$	—	$	—	$	1,098
Corporate stock	58,291		—		—		58,291
Corporate bonds	—		99		—		99
Total	$	59,389	$	99	$	—	$	59,488
Pension plan investments valued using net asset value as a practical expedient:
Common collective trust - equities							$	172,046
Common collective trust - fixed income							135,914
Hedge funds							14,290
Partnership/joint venture interests							11,796
Interest in registered investment companies							6,659
Total fair value of plan assets							$	400,193