Other Expense (Income) (Summary of other expense (income)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Nonoperating Income (Expense) [Abstract]
Foreign currency losses	$ 9,613	$ 8,395	$ 1,099
Release of indemnification asset	4,606	4,459	5,371
All other, net	(6,921)	(7,649)	(8,199)
Total other expense (income)	$ 7,298	$ 5,205	$ (1,729)