Loans Receivable (Summary Of Changes In Allowance For Credit Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 159,373		$ 135,868		$ 154,318		$ 126,868
Provision for credit losses	2,710		8,928		7,957		17,844
Write-offs	(748)		(537)		(1,509)		(966)
Recoveries	570	[1]	560	[1]	1,139	[1]	1,073	[1]
Balance, end of period	161,905		144,819		161,905		144,819
Dealer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	148,225		122,801		141,712		113,227
Provision for credit losses	3,596		8,870		10,230		18,298
Write-offs	(340)		(476)		(1,003)		(827)
Recoveries	550	[1]	533	[1]	1,092	[1]	1,030	[1]
Balance, end of period	152,031		131,728		152,031		131,728
Purchased Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	11,148		13,067		12,606		13,641
Provision for credit losses	(886)		58		(2,273)		(454)
Write-offs	(408)		(61)		(506)		(139)
Recoveries	20	[1]	27	[1]	47	[1]	43	[1]
Balance, end of period	$ 9,874		$ 13,091		$ 9,874		$ 13,091

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