Stockholders' Equity and Partners' Capital - Narrative (Details) - USD ($) |
1 Months Ended | 9 Months Ended | |
|---|---|---|---|
Aug. 31, 2017 |
Feb. 29, 2016 |
Sep. 30, 2017 |
|
| Subsidiary, Sale of Stock [Line Items] | |||
| Shares withheld for taxes | 400,000 | ||
| Shares withheld for taxes, value | $ 3,500,000 | ||
| Stock repurchase program, authorized amount | $ 250,000,000 | $ 200,000,000 | |
| Stock repurchase program, period in force (in months) | 18 months | 18 months | |
| Stock repurchased during period (in shares) | 26,337,295 | 2,482,570 | |
| Stock repurchased, weighted average price (in dollars per share) | $ 7.59 | $ 8.75 | |
| Stock repurchase program, remaining authorized repurchase amount | $ 228,300,000 | ||
| Stock repurchased, fees acquired | $ 500,000 | $ 49,700 | |
| ATM Program, November 2016 | |||
| Subsidiary, Sale of Stock [Line Items] | |||
| Issuance of common shares (in shares) | 0 | ||
| Gross proceeds capacity remaining | $ 500,000,000 | ||