Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2011

Accrued Expenses [Abstract]

Summary of accrued expenses

	2011		2010
Payroll	$	10,519	$	13,621
Interest		36,125		37,350
Insurance benefits		12,338		11,958
Accrued lease expense		26,975		26,851
Other		8,697		6,762
	$	94,654	$	96,542