Leases (Schedule of Lease Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease assets	$ 130,397	$ 137,737
Financing lease assets	89	113
Total leased assets	130,486	137,850
Current operating lease liabilities	32,270	26,993
Current finance lease liabilities	174	162
Noncurrent operating lease liabilities	122,682	131,451
Noncurrent finance lease liabilities	184	274
Total lease liabilities	$ 155,310	$ 158,880