Segment Reporting (Schedule of Automotive Customers Individually Accounted For 10% or More of Net Sales) (Details) - automotive_customer	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue, Major Customer [Line Items]
Percentage net sales invoiced and paid in foreign currencies	8.00%	7.00%	6.00%
Number of customers which individually accounted for 10% or more of net sales	4
Customer concentration risk | Toyota Motor Corporation
Revenue, Major Customer [Line Items]
Percentage of revenue individually accounted by customers (less than 10% for Daimler AG in 2016 and 2015)	12.00%	11.00%	11.00%
Customer concentration risk | Volkswagen Group
Revenue, Major Customer [Line Items]
Percentage of revenue individually accounted by customers (less than 10% for Daimler AG in 2016 and 2015)	15.00%	14.00%	14.00%
Customer concentration risk | Ford Motor Company
Revenue, Major Customer [Line Items]
Percentage of revenue individually accounted by customers (less than 10% for Daimler AG in 2016 and 2015)	10.00%	11.00%	11.00%
Customer concentration risk | Daimler AG
Revenue, Major Customer [Line Items]
Percentage of revenue individually accounted by customers (less than 10% for Daimler AG in 2016 and 2015)	10.00%	10.00%	10.00%