Leases (Balance Sheet Disclosures) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating leases
Right of use assets from operating leases	$ 5,853	$ 14,999
Account payable and accrued liabilities	4,301	12,467
Noncurrent operating lease obligation	1,239	$ 2,532
Total lease liabilities	5,540
Financing leases
Plant, property and equipment, net	1,478
Long-term debt and financing leases, classified as current	381
Long-term debt and financing leases, less current maturities	1,106
Total lease liabilities	$ 1,487		$ 11,677