Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2012

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

Fair value assets and liabilities measured on recurring basis

The following table provides a summary of the Company’s significant financial assets and liabilities carried at fair value and measured on a recurring basis (in thousands):

			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	$	—
Guaranteed Repurchase Agreements	$	—	$	—	$	—	$	—
Rabbi Trust	$	7,718	$	7,718	$	—	$	—
Fixed income securities	$	2,152	$	—	$	2,152	$	—
Liabilities:
Interest rate swap derivative liability	$	708	$	—	$	708	$	—

			Fair Value Measurements at January 1, 2012
	Carrying Value at January 1, 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	$	7,440	$	—	$	7,440	$	—
Restricted investments:
Guaranteed Investment Contact	$	5,742	$	—	$	5,742	$	—
Guaranteed Repurchase Agreements	$	33,821	$	—	$	33,821	$	—
Rabbi Trust	$	8,016	$	5,898	$	2,118	$	—
Fixed income securities	$	2,013	$	—	$	2,013	$	—