Restructuring Charges - Cost and Expense Categories (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]
Severance and other restructuring costs	$ 31,213	$ 0	$ 103,924	$ 0	$ 149,100
Cost of sales
Restructuring Cost and Reserve [Line Items]
Severance and other restructuring costs	5,741	0	5,741	0
Other selling and administrative
Restructuring Cost and Reserve [Line Items]
Severance and other restructuring costs	$ 25,472	$ 0	$ 98,183	$ 0