Leases (Balance Sheet Disclosures) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating leases
Right of use assets from operating leases	$ 9,005	$ 14,999
Less: current maturities of lease obligations	6,930	12,467
Noncurrent operating lease obligation	2,075	$ 2,532
Total lease liabilities	9,005
Lessee, Finance Lease, Description [Abstract]
Plant, property and equipment, net	11,456
Long-term debt and financing leases, classified as current	10,617
Long-term debt and financing leases, less current maturities	1,003
Total lease liabilities	$ 11,620		$ 11,677