Summary of Significant Accounting Policies (New Accounting Pronouncements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholders’ equity	$ (659,687)		$ (685,016)	$ (547,366)	$ (331,760)
Goodwill impairment	46,252
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholders’ equity		$ 2,263	$ (2,263)	$ (1,550)	$ (4,576)
Allowance for credit losses		$ 3,100
Goodwill impairment	$ 46,252