Accounts and Notes Receivable and Allowance for Credit Losses (Tables)

12 Months Ended

Dec. 31, 2011

Contractual Amounts Due under Leases

Year	Contractual amounts due under leases
2012	$	126,598
2013		108,242
2014		99,389
Thereafter		1,231
Total		335,460
Less amounts representing interest		(6,856)
Present value		328,604
Current portion (included in accounts and notes receivable)		123,896
Long-term portion (included in other assets, net)	$	204,708

Allowance for Credit Losses

	December 31, 2011		December 31, 2010
Balance, beginning of the year	$	44,661	$	40,199
Recoveries		(31,531)		(25,171)
Provisions		11,117		29,633
Balance, end of the year	$	24,247	$	44,661