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Related Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Related Party Transaction [Line Items] |  |
Payments of dividends | $ 0 | $ 550,000
Apollo Management Holdings, L.P. | Management |  |
Related Party Transaction [Line Items] |  |
Management fee expense | 1,000 | 5,000
Koch | Affiliated Entity | Structuring Fees |  |
Related Party Transaction [Line Items] |  |
Amounts of transaction |  | 45,000
Koch | Affiliated Entity | Mandatorily Redeemable Preferred Stock |  |
Related Party Transaction [Line Items] |  |
Financial instruments subject to mandatory redemption, increase during period | 25,000 |
Payments of dividends |  | $ 21,000
Apollo Global Securities, LLC | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Payments of stock issuance costs | $ 2,000 |
Apollo Global Securities, LLC | Affiliated Entity | Over-Allotment Option |  |
Related Party Transaction [Line Items] |  |
Shares issued in public offering (in shares) | 4,200,000 |

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