Restructuring Charges (Restructuring Charges) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Costs
Balance Beginning	$ 43,720	$ 28,657
Expenses, net	1,021	1,486
Cash payments	(15,702)	(12,416)
Balance Ending	$ 29,039	17,727
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	28,376
Expenses, net	952	1,419
Cash payments	(15,125)	(12,294)
Balance Ending	27,978	17,501
Other exit costs
Restructuring Costs
Balance Beginning	1,569	281
Expenses, net	69	67
Cash payments	(577)	(122)
Balance Ending	$ 1,061	$ 226