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Stock-Based Compensation Plans and Employee Benefits (Performance Incentive Plans) (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) shares $ / shares | Dec. 31, 2017 USD ($)
Performance Incentive Plan |  |
Preferred return (as a percent) | 9.00% |
Reduction in amount distributable (percent) | 4.30% |
Accrued expenses | $ | $ 97,007 | $ 101,035
iPIP Plans |  |
Performance Incentive Plan |  |
iPIP distributions to plan participants | $ | 15,600 |
iPIP distributions, cash component | $ | $ 7,800 |
iPIP distributions, equity component (in shares) | 685,624 |
iPIP distributions, equity component, fair value | $ | $ 7,800 |
iPIP distributions, equity component, fair value (in dollars per share) | $ / shares | $ 11.37 |
iPIP distributions, shares issued net of tax withholdings (in shares) | 374,055 |
Accrued expenses | $ | $ 37,500 | $ 38,100
2013-2014 Performance Incentive Plan |  |
Performance Incentive Plan |  |
Points at beginning of period (in shares) | 85.77 |
Granted (in shares) | 0.50 |
Forfeited (in shares) | (1.30) |
Points at end of period (in shares) | 86.57 |
2015-2016 Performance Incentive Plan |  |
Performance Incentive Plan |  |
Points at beginning of period (in shares) | 79.41 |
Granted (in shares) | 0.00 |
Forfeited (in shares) | (4.75) |
Points at end of period (in shares) | 84.16 |
2017-2018 Performance Incentive Plan |  |
Performance Incentive Plan |  |
Points at beginning of period (in shares) | 82.43 |
Granted (in shares) | 49.33 |
Forfeited (in shares) | (7.87) |
Points at end of period (in shares) | 40.97 |

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