The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Name:	us-gaap_RetainedEarningsAccumulatedDeficit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Organization Consolidation Basis Of Presentation Business Description And Accounting Policies [Line Items]
Retained earnings	$ 1,569,689		$ 1,593,281
Cumulative Effect, Period of Adoption, Adjustment [Member]
Organization Consolidation Basis Of Presentation Business Description And Accounting Policies [Line Items]
Retained earnings		$ 1,200