Leases (Schedule of Supplemental Balance Sheet Information Related to Leases) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating leases
Right of use assets included in Other assets	$ 12,969
Total operating lease liabilities	13,117
Finance lease
Right of use assets included in Property, plant and equipment, net	10,890
Total finance lease liabilities	19,780	$ 25,900
Accrued liabilities [Member]
Operating leases
Total operating lease liabilities	4,182
Finance lease
Total finance lease liabilities	1,216
Other Noncurrent Liabilities [Member]
Operating leases
Total operating lease liabilities	8,935
Finance lease
Total finance lease liabilities	$ 18,564