Restructuring Charges and Asset Impairment (Restructuring Charges) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Restructuring Costs
Balance Beginning	$ 43,720	$ 28,515
Expenses, net	19,929	25,544
Cash payments	(39,100)	(28,442)
Balance Ending	$ 24,549	25,617
Restructuring reserve, expected international payment period, extend beyond	24 months
Minimum
Restructuring Costs
Restructuring reserve, expected payment period	12 months
Maximum
Restructuring Costs
Restructuring reserve, expected payment period	24 months
Severance and benefits costs
Restructuring Costs
Balance Beginning	$ 42,151	28,234
Expenses, net	13,655	23,832
Cash payments	(37,511)	(27,724)
Balance Ending	18,295	24,342
Other exit costs
Restructuring Costs
Balance Beginning	1,569	281
Expenses, net	6,274	1,712
Cash payments	(1,589)	(718)
Balance Ending	$ 6,254	$ 1,275