New Accounting Standards - Narrative (Details) - Accounting Standards Update 2017-07 $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Sales General and Administrative Expense
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest cost	$ (1,210)
Net periodic pension and postretirement benefit	(1,820)
Interest Expense
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest cost	1,210
Other Income Net
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic pension and postretirement benefit	$ 1,820