Stockholders' Equity and Partners' Capital - Narrative (Details) - USD ($)
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1 Months Ended |
3 Months Ended |
6 Months Ended |
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May 29, 2018 |
Mar. 05, 2018 |
May 31, 2018 |
Aug. 31, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Dec. 31, 2017 |
| Subsidiary, Sale of Stock [Line Items] |
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| Shares withheld for taxes |
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200,000
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| Shares withheld for taxes, value |
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$ 1,700,000
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| Preferred stock, shares outstanding |
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6,900,000
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6,900,000
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6,900,000
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| Dividend rate |
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6.00%
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| Liquidation value (in dollars per share) |
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$ 25
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$ 25
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| Dividend rate, quarterly basis (in dollars per share) |
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0.375
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| Dividend rate, annual basis (in dollars per share) |
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$ 1.5
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| Less: dividends paid to preferred stockholders |
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$ 2,588,000
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$ 0
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$ 5,176,000
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$ 0
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| Dividends, preferred stock |
$ 2,588,000
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$ 2,588,000
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$ 5,176,000
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| Stock repurchase program, authorized amount |
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$ 250,000,000
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$ 250,000,000
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| Stock repurchase program, period in force |
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18 months
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18 months
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| Stock repurchased during period (in shares) |
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21,200,000
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| Stock repurchased, weighted average price (in dollars per share) |
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$ 7.90
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| Stock repurchase program, remaining authorized repurchase amount |
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0
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$ 0
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| Stock repurchased, fees acquired |
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$ 500,000
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| ATM Program, November 2016 |
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| Subsidiary, Sale of Stock [Line Items] |
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| Issuance of common shares (in shares) |
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0
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| Gross proceeds capacity remaining |
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$ 500,000,000
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$ 500,000,000
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