Restructuring Charges and Asset Impairments (Restructuring Charges) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Restructuring Costs
Balance Beginning	$ 28,657	$ 47,422
Expenses, net	26,937	38,451
Cash payments	(29,976)	(51,161)
Balance Ending	$ 25,618	34,712
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	$ 28,376	43,700
Expenses, net	25,225	36,791
Cash payments	(29,259)	(47,241)
Balance Ending	24,342	33,250
Other exit costs
Restructuring Costs
Balance Beginning	281	3,722
Expenses, net	1,712	1,660
Cash payments	(717)	(3,920)
Balance Ending	$ 1,276	$ 1,462