Leases (Lease Assets and Lease Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2018
Lease Right-of-Use Assets
Operating lease right-of-use assets	$ 103,336	$ 106,514	$ 0	$ 0
Finance lease right-of-use assets	2,412
Total Lease Right-of-Use Assets	105,748
Lease Liabilities
Operating lease liabilities	110,483	$ 113,394	$ 0	$ 0
Finance lease liabilities	10,605
Total Lease Liabilities	$ 121,088