Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

The following table summarizes the fair value balances (in thousands):

			Fair Value Measurement at
			June 30, 2018
	Total		Level 1		Level 2		Level 3
Assets:
Deferred compensation assets (1)	$	47,327	$	—	$	47,327	$	—
5 year interest rate swap	205		—		205		—
10 year interest rate swap	344		—		344		—
	47,876		—		47,876		—
Liabilities:
Deferred compensation plan	$	38,583	$	—	$	38,583	$	—
	$	38,583	$	—	$	38,583	$	—

			Fair Value Measurement at
			December 31, 2017
	Total		Level 1		Level 2		Level 3
Assets:
Deferred compensation assets (1)	$	46,145	$	—	$	46,145	$	—
5 year interest rate swap	70		—		70		—
	$	46,215	$	—	$	46,215	$	—
Liabilities:
Deferred compensation plan	$	37,280	$	—	$	37,280	$	—
10 year interest rate swap	492		—		492		—
	$	37,772	$	—	$	37,772	$	—
(1) Deferred compensation assets consist of the cash surrender value of life insurance policies and are intended to assist in the funding of the deferred compensation agreements.