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Variable Interest Entity and Noncontrolling Interests - Variable interest entity (Details) - USD ($) $ in Thousands	1 Months Ended
	Mar. 31, 2014	Jul. 01, 2021	Mar. 31, 2015
Greysbridge Holdings Ltd
Variable Interest Entity [Line Items]
Percentage ownership		40.00%
Greysbridge Holdings Ltd | Kelso And Company
Variable Interest Entity [Line Items]
Percentage ownership		30.00%
Greysbridge Holdings Ltd | Warburg Pincus
Variable Interest Entity [Line Items]
Percentage ownership		30.00%
Variable Interest Entity, Primary Beneficiary | Somers Holdings Ltd.
Variable Interest Entity [Line Items]
Initial investment contribution amount	$ 100,000
Variable Interest Entity, Primary Beneficiary | Common shares | Somers Holdings Ltd.
Variable Interest Entity [Line Items]
Number of shares acquired			2,500,000

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

Balance held at close of period in number of shares.

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The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).

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