Leases (Lease Assets and Lease Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2018
Lease Right-of-Use Assets
Operating lease right-of-use assets	$ 101,005	$ 106,514	$ 0	$ 0
Finance lease right-of-use assets	2,394
Total Lease Right-of-Use Assets	103,399
Lease Liabilities
Operating lease liabilities	108,264	$ 113,394	$ 0	$ 0
Finance lease liabilities	10,585
Total Lease Liabilities	$ 118,849