Summary of Significant Accounting Policies (New Accounting Pronouncements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adoption of new accounting standards	$ (1,550)	$ (4,576)
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adoption of new accounting standards	3,147	6,354
Accumulated Deficit | Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adoption of new accounting standards	4,697
Accumulated Other Comprehensive Income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adoption of new accounting standards	$ (4,697)	$ (6,036)