XML 33 R42.htm IDEA: XBRL DOCUMENT

Summary Of Significant Accounting Policies (Allowance For Doubtful Accounts Related To Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary Of Significant Accounting Policies [Abstract]
Allowance for doubtful accounts beginning of year	$ 14,256	$ 14,764	$ 10,407
Provision for bad debts	19,226	18,883	32,593
Write-offs	(18,167)	(19,391)	(28,236)
Allowance for doubtful accounts end of year	$ 15,315	$ 14,256	$ 14,764

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

+ References+ Details