Fair Value Measurements and Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2012

Jul. 02, 2011

Financial Instruments and Fair Value Measurements [Abstract]

Assets and liabilities measured at fair value on a recurring basis [Table Text Block]

Our assets and liabilities measured at fair value on a recurring basis at June 30, 2012, were as follows:

			Fair Value Measurements at June 30, 2012 Using:
Assets and Liabilities Recorded at Fair Value on a Recurring Basis	Total Carrying Value at June 30, 2012		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Assets invested for self-insurance, classified as other assets, noncurrent	$	14,156	$	14,156	$	—	$	—
Liabilities:
Fuel derivatives, classified as accrued expenses	$	306	$	—	$	306	$	—
Fuel derivatives, classified as other noncurrent liabilities	237		—		237		—
Deferred compensation	787		—		787		—

Our assets and liabilities measured at fair value on a recurring basis at December 31, 2011 were as follows:

			Fair Value Measurements at December 31, 2011 Using:
Assets and Liabilities Recorded at Fair Value on a Recurring Basis	Total Carrying Value at December 31, 2011		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Assets invested for self-insurance, classified as other assets, noncurrent	$	13,064	$	13,064	$	—	$	—
Liabilities:
Interest rate swaps, classified as accrued expenses	$	123	$	—	$	123	$	—
Fuel derivatives, classified as accrued expenses	108		—		108		—
Fuel derivatives, classified as other noncurrent liabilities	317		—		317		—
Deferred compensation	684		—		684		—

Financial instruments recorded at historical carrying value [Table Text Block]

	June 30, 2012				December 31, 2011
Financial Instruments Recorded at Historical Carrying Value	Carrying Value		Fair Value		Carrying Value		Fair Value
Revolving credit facility, noncurrent	$	28,400	$	28,400	$	20,000	$	20,000
Senior unsecured notes	30,000		30,416		30,000		29,925
Term loans, noncurrent	715		715		1,136		1,135
Total	$	59,115	$	59,531	$	51,136	$	51,060

Schedule of derivative instruments in statement of financial position, fair value [Table Text Block]

The following tables set forth quantitative information related to our derivatives instruments and where these amounts are recorded in our consolidated financial statements.

	As of
	June 30, 2012		December 31, 2011
Cash Flow Hedges - Derivatives Designated as Hedging Instruments
Interest Rate Swaps:
Liability fair value of interest rate swaps, classified as accrued expenses	$	—	$	123
Notional amount of long-term debt hedged	$	—	$	10,000
Economic Hedges - Derivatives Not Designated as Hedging Instruments
Fuel Derivatives:
Liability fair value of fuel derivatives, classified as accrued expenses	$	306	$	108
Liability fair value of fuel derivatives, classified as other noncurrent liabilities	$	237	$	317
Longest remaining term, in months	18		24
Notional hedged volume, in thousands of gallons	1,900		2,500

	Three Months Ended					Six Months Ended
	June 30, 2012			July 2, 2011		June 30, 2012		July 2, 2011
Cash Flow Hedges - Derivatives Designated as Hedging Instruments
Interest Rate Swaps:
Hedge gains, recognized in other comprehensive income	$	—		$	223	$	123	$	441
Economic Hedges - Derivatives Not Designated as Hedging Instruments
Fuel Derivatives:
Change in fair value, recognized in results of operations, as an (increase in)/decrease in operating costs and expenses	$	(888	)	$	22	$	34	$	22