Restructuring Charges (Restructuring Charges) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Restructuring Costs
Balance Beginning	$ 43,720	$ 28,515
Expenses, net	12,407	24,049
Cash payments	(27,528)	(17,651)
Balance Ending	$ 28,599	34,913
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	7,990	22,489
Cash payments	(26,942)	(17,154)
Balance Ending	23,199	33,569
Other exit costs
Restructuring Costs
Balance Beginning	1,569	281
Expenses, net	4,417	1,560
Cash payments	(586)	(497)
Balance Ending	$ 5,400	$ 1,344