Accounts and Notes Receivable and Credit Quality of Notes Receivable (Concentration Risk) (Details) (Geographic concentration risk, Notes receivable)	3 Months Ended
	Mar. 31, 2015
Mexico
Concentration Risk [Line Items]
Concentration risk percentage	15.00%
Peru
Concentration Risk [Line Items]
Concentration risk percentage	16.00%
Argentina
Concentration Risk [Line Items]
Concentration risk percentage	8.00%
Colombia
Concentration Risk [Line Items]
Concentration risk percentage	5.00%
Italy
Concentration Risk [Line Items]
Concentration risk percentage	7.00%
Other (less than 5% individually)
Concentration Risk [Line Items]
Concentration risk percentage	16.00%
Total international notes receivable as a percentage of total notes receivable
Concentration Risk [Line Items]
Concentration risk percentage	67.00%