Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Activity related to unrecognized tax benefits
Beginning balance	$ 0	$ 4,378,000	$ 10,419,000
Additions for tax positions related to prior years	5,045,000	30,103,000	0
Deductions for tax positions related to prior years	0	(34,481,000)	(3,969,000)
Settlements with taxing authorities	0	0	(2,072,000)
Ending balance	5,045,000	0	4,378,000
(Reversal) charge of Interest and penalties related to income taxes	564,000	(6,300,000)	$ (2,000,000.0)
Total interest and penalties accrued	$ 564,000	$ 0