Financial Instruments and Derivative Financial Instruments Concentration of Credit Risks (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Concentration Risk, Benchmark Description	No single customer exceeded ten percent of consolidated sales in 2014, 2013 and 2012.
Geographic Concentration Risk [Member]
Derivative [Line Items]
Concentration Risk, Percentage	53.00%	59.00%	56.00%
Customer Concentration Risk [Member]
Derivative [Line Items]
Concentration Risk, Percentage	34.00%	37.00%	38.00%