Accounts and Notes Receivable and Credit Quality of Notes Receivable (Concentration Risk) (Details) - Geographic concentration risk - Notes receivable	6 Months Ended
	Jun. 30, 2015
Mexico
Concentration Risk [Line Items]
Concentration risk, percentage	17.00%
Peru
Concentration Risk [Line Items]
Concentration risk, percentage	17.00%
Argentina
Concentration Risk [Line Items]
Concentration risk, percentage	7.00%
Colombia
Concentration Risk [Line Items]
Concentration risk, percentage	6.00%
Italy
Concentration Risk [Line Items]
Concentration risk, percentage	4.00%
Other (less than 5% individually)
Concentration Risk [Line Items]
Concentration risk, percentage	15.00%
Concentration risk, individual percentage	0.050
Total international notes receivable as a percentage of total notes receivable
Concentration Risk [Line Items]
Concentration risk, percentage	66.00%