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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Financial Instruments Disclosure [Abstract] |
Carrying Value and Estimated Fair Value of Company's Financial Instruments | The following table presents the carrying value and estimated fair value of the Company’s financial instruments not carried at fair value on the consolidated balance sheet at December 31, 2017 and 2016:
| December 31, 2017 |  | December 31, 2016
| Carrying Value |  | Estimated Fair Value |  | Carrying Value |  | Estimated Fair Value
Cash and cash equivalents | $ | 77,671 |  |  | $ | 77,671 |  |  | $ | 200,996 |  |  | $ | 200,996 |
Restricted cash | — |  |  | — |  |  | 62,457 |  |  | 62,457 |
Securities, held-to-maturity | — |  |  | — |  |  | 146,352 |  |  | 146,489 |
Commercial first mortgage loans, net | 2,653,826 |  |  | 2,657,262 |  |  | 1,641,856 |  |  | 1,648,896 |
Subordinate loans, net | 1,025,932 |  |  | 1,029,390 |  |  | 1,051,236 |  |  | 1,060,882 |
Secured debt arrangements | (1,345,195 | ) |  | (1,345,195 | ) |  | (1,146,566 | ) |  | (1,146,807 | )
2019 Notes | (251,935 | ) |  | (276,506 | ) |  | (249,994 | ) |  | (268,124 | )
2022 Notes | (332,962 | ) |  | (350,175 | ) |  | — |  |  | — |
Participations sold | — |  |  | — |  |  | (84,979 | ) |  | (85,072 | )

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