Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2016

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Fair value assets and liabilities measured on recurring basis

The following tables provide a summary of the Company’s significant financial assets and liabilities carried at fair value and measured on a recurring basis as of June 30, 2016 and December 31, 2015 (in thousands):

			Fair Value Measurements at June 30, 2016
	Carrying Value at June 30, 2016		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Restricted investment:
Rabbi Trust	$	14,973	$	—	$	14,973	$	—
Fixed income securities	1,833		—		1,833		—
Interest rate cap derivatives	13		—		$	13	—
Liabilities:
Interest rate swap derivatives	$	26,288	$	—	$	26,288	$	—

			Fair Value Measurements at December 31, 2015
	Carrying Value at December 31, 2015		Quoted Prices in Active Markets (Level 1)		Significant Other Observable  Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Restricted investments:
Rabbi Trust	$	13,071	$	—	$	13,071	$	—
Fixed income securities	1,717		—		1,717		—
Interest rate cap derivatives	93		—		93		—
Liabilities:
Interest rate swap derivatives	$	20,835	$	—	$	20,835	$	—