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Credit Risk (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Credit Risk
Total stockholder's equity	$ 4,056,855	$ 3,378,588
Excess net capital	10,000
Allowance for doubtful accounts	120	$ 195
Minimum
Credit Risk
Total stockholder's equity	$ 25,000

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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