Leases (Supplemental Balance Sheet Information Related To Leases) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Leases
Operating lease right-of-use assets	$ 36,421	$ 39,100	$ 0
Operating lease liabilities - current	6,739		0
Operating lease liabilities - long-term	45,391		$ 0
Total operating lease liabilities	52,130	$ 55,800
Finance leases
Other property and equipment	1,736
Accumulated depreciation	(1,465)
Other property and equipment, net	271
Current maturities of long-term debt	233
Long-term debt, net of current portion	59
Total finance lease liabilities	$ 292