Leases (Schedule of Lease Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease assets	$ 125,258	$ 132,374
Total leased assets	125,258	132,374
Current operating lease liabilities	27,315	27,223
Noncurrent operating lease liabilities	114,261	122,678
Total lease liabilities	$ 141,576	$ 149,901