Leases (Schedule of Lease Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease assets	$ 133,256	$ 137,737
Financing lease assets		113
Total leased assets	133,256	137,850
Current operating lease liabilities	28,239	26,993
Current finance lease liabilities		162
Noncurrent operating lease liabilities	124,678	131,451
Noncurrent finance lease liabilities		274
Total lease liabilities	$ 152,917	$ 158,880