Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Jan. 01, 2020	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 27, 2018
Accounting Policies [Abstract]
Stock dividend paid to company stockholders								5.00%
Embedded Derivative [Line Items]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Impact of adoption of new accounting standards		$ (718,999)	$ (669,204)	$ (685,016)	$ (606,696)	$ (590,101)	$ (547,366)
Goodwill impairment charge		$ 46,262
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