Loans To And Investments In Associated Companies (Garcadia) (Narrative) (Details)	Mar. 31, 2017 Dealership
Garcadia [Member]
Investments In Associated Companies [Line Items]
Number of automobile dealerships	28
Plan One [Member] | Garcadia [Member]
Investments In Associated Companies [Line Items]
Percentage of cash F\flows allocated from joint venture	65.00%
Plan One [Member] | Garff Enterprises, Inc [Member]
Investments In Associated Companies [Line Items]
Percentage of cash F\flows allocated from joint venture	35.00%
Plan Two [Member] | Garcadia [Member]
Investments In Associated Companies [Line Items]
Number of automobile dealerships	1
Percentage of cash F\flows allocated from joint venture	83.00%
Plan Three [Member] | Garcadia [Member]
Investments In Associated Companies [Line Items]
Number of automobile dealerships	4
Percentage of cash F\flows allocated from joint venture	71.00%