Restructuring and Asset Impairment Charges (Employee Position Elimination Rollforward) (Details) - employee	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Restructuring and Related Cost, Number of Positions Eliminated [Roll Forward]
Planned reductions, January 1	82	133
Additional planned reductions	612	87
Actual reductions	(506)	(138)
Planned reductions, December 31	188	82