Recent Accounting Pronouncements Recently Adopted Accounting Guidance (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting standards update upon adoption	$ (1,545,179)		$ (1,549,688)	$ (1,486,746)
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting standards update upon adoption	$ (2,332,509)	$ (2,293,229)	(2,235,320)	$ (2,166,039)	$ (2,124,672)	$ (2,066,073)
Accounting Standards Update 2016-13 | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting standards update upon adoption		$ 0	$ 493		$ 0	$ 0