Nature of Operations and Basis of Presentation - Variable Interest Entities (Details) $ in Thousands	6 Months Ended
Jun. 30, 2021 USD ($) variable_interest_entity	Dec. 31, 2020 USD ($)
Variable Interest Entity [Line Items]
Number of variable interest entities \| variable_interest_entity	1
Fair value of VIE	$ 3,058,153	$ 3,069,678
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Fair value of VIE	$ 3,371

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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+ Details