Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2011

Accrued Expenses [Abstract]

Schedule Of Accrued Expenses

	December 31,
	2011		2010
Compensation related	$	27,068	$	20,936
Workers' compensation self-insured risk reserve		4,967		3,968
Health self-insured risk reserve		3,928		4,374
Authority for expenditure accrual		379		141
Ad valorem taxes		5		171
Sales tax		2,590		1,343
Insurance obligations		6,174		3,576
Purchase order accrual		—		39
Professional fee accrual		497		564
Contingent earnout obligation		345		346
Fuel accrual		1,432		1,415
Accrued interest		17,711		14,364
	$	65,096	$	51,237