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Stock-Based Compensation Plans and Employee Benefits - Performance Incentive Plans (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) shares ownership_class $ / shares | Mar. 31, 2018 USD ($) shares | Dec. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity-based compensation | $ | $ 4,249 | $ 9,091 |
Performance Incentive Plan |  |  |
Accrued expenses | $ | $ 71,305 |  | $ 95,149
iPIP Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 6 years |  |
Performance Incentive Plan |  |  |
iPIP distributions to plan participants | $ | $ 7,400 |  |
iPIP distributions, cash component | $ | $ 3,800 |  |
iPIP distributions, equity component (in shares) | 389,545 |  |
iPIP distributions, equity component, fair value | $ | $ 3,600 |  |
iPIP distributions, equity component, fair value (in dollars per share) | $ / shares | $ 9.21 |  |
iPIP distributions, shares issued net of tax withholdings (in shares) | 209,118 |  |
Accrued expenses | $ | $ 33,000 |  | $ 37,500
iPIP Plans | Vesting at end of second year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting rights percentage | 40.00% |  |
iPIP Plans | Vesting in each of years three through six |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting rights percentage | 15.00% |  |
2013-2014 Performance Incentive Plan |  |  |
Performance Incentive Plan |  |  |
Points at beginning of period (in shares) | 85.77 |  | 85.77
Granted (in shares) | 0.00 |  | 0.50
Forfeited (in shares) | (0.00) |  | (1.30)
Points at end of period (in shares) | 85.77 | 86.57 | 86.57
2015-2016 Performance Incentive Plan |  |  |
Performance Incentive Plan |  |  |
Points at beginning of period (in shares) | 78.59 |  | 79.41
Granted (in shares) | 0.00 |  | 0.00
Forfeited (in shares) | (0.82) |  | (4.75)
Points at end of period (in shares) | 79.41 | 84.16 | 84.16
2017-2018 Performance Incentive Plan |  |  |
Performance Incentive Plan |  |  |
Points at beginning of period (in shares) | 81.40 |  | 82.43
Granted (in shares) | 0.00 |  | 49.33
Forfeited (in shares) | (1.03) |  | (7.87)
Points at end of period (in shares) | 82.43 | 40.97 | 40.97
2019-2020 Performance Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of ownership classes of consolidated subsidiary | ownership_class | 2 |  |
Ownership percentage of class A units (percent) | 100.00% |  |
Equity-based compensation | $ | $ 400 |  |
Settlement or distribution on units and awards, cash (percent) | 50.00% |  |
Settlement or distribution on units and awards, common stock (percent) | 50.00% |  |
2013-2018 Performance Incentive Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Settlement or distribution on units and awards, cash (percent) | 50.00% |  |
Settlement or distribution on units and awards, common stock (percent) | 50.00% |  |

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