Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Jan. 01, 2020	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Embedded Derivative [Line Items]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Impact of adoption of new accounting standards		$ 669,204	$ 662,119	$ 685,016	$ 628,673	$ 606,696	$ 547,366
Goodwill impairment charge		$ 46,252
Accounting Standards Update 2016-13
Embedded Derivative [Line Items]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Accounting Standards Update 2017-04
Embedded Derivative [Line Items]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201704Member
Impact of adoption of new accounting standards
Embedded Derivative [Line Items]
Impact of adoption of new accounting standards	$ 2,263			$ 2,263			$ 1,550
Allowance for credit losses	$ 3,100
Goodwill impairment charge			$ 46,252