Stock Based Compensation - RSUs under the Subsidiary Incentive Plans Rollforward (Details) - Subsidiary Incentive Plan - Restricted Stock Units (RSUs) $ in Thousands	9 Months Ended
Sep. 30, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested balance as of December 31, 2018	$ 8,710
Granted	0
Vested	(4,991)
Unvested balance as of September 30, 2019	$ 3,719
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Nonvested Shares, If Converted \| shares	2,728,675
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested Shares, If Converted \| shares	981,400

Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Nonvested

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Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Nonvested Shares, If Converted

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Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested Shares, If Converted

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Share-Based Compensation Arrangement By Share-Based Payment Award, Vested In Period

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Granted

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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