Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2013

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, 2013 and December 31, 2012 (in thousands):

			Fair Value Measurements at June 30, 2013
	Carrying Value at June 30, 2013		Quoted Prices in Active Markets (Level 1)		Significant Other Observable  Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Interest rate swap derivative assets	$	4,599	$	—	$	4,599	$	—
Restricted investments:
Guaranteed Investment Contract	5,742		—		5,742		—
Rabbi Trust	8,163		8,163		—		—
Fixed income securities	1,996		—		1,996		—
Liabilities:
Interest rate swap derivative liabilities	$	490	$	—	$	490	$	—

			Fair Value Measurements at December 31, 2012
	Carrying Value at December 31, 2012		Quoted Prices in Active Markets (Level 1)		Significant Other Observable  Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Interest rate swap derivative assets	$	6,212	$	—	$	6,212	$	—
Restricted investments:
Guaranteed Investment Contract	5,742		—		5,742		—
Rabbi Trust	7,718		7,718		—		—
Fixed income securities	2,152		—		2,152		—
Liabilities:
Interest rate swap derivative liabilities	$	708	$	—	$	708	$	—