Loans Receivable (Summary Of Changes In Allowance For Credit Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 161,905		$ 144,819		$ 154,318		$ 126,868
Provision for credit losses	9,759		4,550		17,716		22,394
Write-offs	(1,506)		(804)		(3,015)		(1,770)
Recoveries	605	[1]	463	[1]	1,744	[1]	1,536	[1]
Balance, end of period	170,763		149,028		170,763		149,028
Dealer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	152,031		131,728		141,712		113,227
Provision for credit losses	10,151		4,723		20,381		23,021
Write-offs	(1,480)		(736)		(2,483)		(1,563)
Recoveries	582	[1]	442	[1]	1,674	[1]	1,472	[1]
Balance, end of period	161,284		136,157		161,284		136,157
Purchased Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	9,874		13,091		12,606		13,641
Provision for credit losses	(392)		(173)		(2,665)		(627)
Write-offs	(26)		(68)		(532)		(207)
Recoveries	23	[1]	21	[1]	70	[1]	64	[1]
Balance, end of period	$ 9,479		$ 12,871		$ 9,479		$ 12,871

[1] Represents collections received on previously written off Loans.