Basis of Presentation - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gain (loss) on disposition of assets		$ (900)
Selling, general and administrative expenses	$ 40,597	34,569
Other operating (income) expense, net	3,591	942
Other income (expense), net	$ 66	1,119
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Selling, general and administrative expenses		(400)
Other income (expense), net		$ 400