Leases (Schedule of Supplemental Balance Sheet Information Related to Leases) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating leases
Right of use assets included in Other assets	$ 14,443
Total operating lease liabilities	14,491
Finance lease
Right of use assets included in Property, plant and equipment, net	10,472
Total finance lease liabilities	19,487	$ 25,900
Accrued liabilities [Member]
Operating leases
Operating lease liabilities current	3,854
Finance lease
Finance lease liabilities current	1,252
Other Noncurrent Liabilities [Member]
Operating leases
Operating lease liabilities noncurrent	10,637
Finance lease
Finance lease liabilities noncurrent	$ 18,235