New Accounting Standards - Compensation – Retirement Benefits (Topic 715) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating income	$ (36,119)	$ (18,384)
Other (income) expense, net	$ (3,432)	(11,181)
ASU 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating income		300
Other (income) expense, net		$ 300