Leases (Schedule of Lease Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets
Operating lease right-of-use assets	$ 232,996	$ 0
Finance lease right-of-use assets	9,894
Total lease assets	242,890
Liabilities
Operating lease liabilities, current	51,632	0
Finance lease liabilities, current	4,192
Operating lease liabilities, long-term	193,502	$ 0
Finance lease liabilities, long-term	5,788
Total lease liabilities	$ 255,114