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Transactions with Related Parties (Narrative) (Details) - Affiliated Entity - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Poseidon
Related Party Transaction [Line Items]
Due from related parties	$ 1,500		$ 1,500		$ 2,400
Related party transaction, revenues	3,035	$ 3,236	6,182	$ 6,401
Related party transaction, costs and expenses	249	255	503	502
Poseidon | Asset Management Arrangement
Related Party Transaction [Line Items]
Related party transaction, revenues	2,300	2,200	4,600	4,500
ANSAC
Related Party Transaction [Line Items]
Due from related parties	45,973		45,973		$ 68,075
Related party transaction, revenues	48,695	81,784	121,774	172,463
Related party transaction, costs and expenses	$ 629	$ 1,279	$ 1,461	$ 2,336

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- Definition

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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