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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative liabilities | $ 0 | $ 498,000 |
Payments to acquire other investments | 41,000 | 103,000 | $ 61,000
Restricted cash and cash equivalents | 20,300,000 | 56,000,000 |
Not Designated as Hedging Instrument | TBA |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative liabilities |  | 148,000,000 |
Proceeds from sale of investments | 0 | 114,400,000 |
Payments to acquire other investments | 0 | 262,400,000 |
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative in liability position |  | 0 |
Derivative liability netted against asset position |  | 133,500 |
Collateral for Hedging Instruments [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Restricted cash and cash equivalents | $ 9,900,000 | $ 6,100,000 |

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