Unpaid Loss and Loss Adjustment Expenses Change in upaid loss and loss adjustmen expenses vehicle servie agreements (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Service Agreements [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense	$ 3,281	$ 3,448
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year			1,670
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years			0
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year			(1,756)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years			(81)
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense	$ 3,281	$ 3,448	$ 3,281