Leases (Narrative) (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 50,192,000	$ 80,906,000	$ 100,000,000.0
Operating Lease, Liability	$ 58,749,000	$ 83,426,000	100,000,000.0
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity impact of adoption			$ 0