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Rationalizations and Impairments (Rationalization-Roll-forward) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
2013 Rationalization Initiatives
Restructuring Reserve [Roll Forward]
Beginning balance	$ 1,035	$ 18,421
Charges incurred	(41)	(613)
Change in estimates	(229)	(153)
Payments and settlements	(1,132)	(16,494)
Effect of change in currency exchange rates	(91)	(1,658)
Ending balance	82	1,035
2014 Engineered Solutions Rationalization
Restructuring Reserve [Roll Forward]
Beginning balance	1,655	0
Charges incurred	(50)	(2,611)
Change in estimates	(749)	(40)
Payments and settlements	(780)	(916)
Ending balance	176	1,655
2014 Corporate and Research & Development Rationalization
Restructuring Reserve [Roll Forward]
Beginning balance	6,873	0
Charges incurred	(34)	8,159
Change in estimates	28	(21)
Payments and settlements	(4,199)	(1,155)
Effect of change in currency exchange rates	(5)	(152)
Ending balance	2,607	6,873
2015 Advanced Graphite Materials Rationalization
Restructuring Reserve [Roll Forward]
Beginning balance	0
Charges incurred	(4,834)
Payments and settlements	(263)
Effect of change in currency exchange rates	(38)
Ending balance	$ 4,533	$ 0

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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