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Summary of Critical and Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Marketable Securities [Line Items] |  |  |  |
Carrying Value |  | $ 3,600 | $ 6,700 |
Equity securities: |  |  |  |
Unrealized gain (loss) on equity securities recognized through income |  | 5,710 | (5,159) | $ 0
Carrying Value |  | 3,600 | 6,700 |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |  |
Total - Marketable securities, amortized cost |  | 140,649 | 211,960 |
Total - Marketable securities, gross unrealized gain (loss) |  | 3,544 | (2,415) |
Total - Marketable securities, carrying value |  | 144,193 | 209,545 |
Proceeds from maturity of mortgage backed security | $ 83,100 |  |  |
Accelerated interest income | $ 7,000 |  |  |
Proceeds from sale and maturities of marketable securities |  | 147,500 | 31,500 | 35,500
Marketable securities, realized gain (loss) |  | 1,300 | 700 | 1,900
Unrealized gain (loss) on equity securities recognized through income |  | 5,710 | (5,159) | $ 0
Interest and Other Income |  |  |  |
Equity securities: |  |  |  |
Unrealized gain (loss) on equity securities recognized through income |  | 5,700 | (5,200) |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |  |
Unrealized gain (loss) on equity securities recognized through income |  | 5,700 | (5,200) |
Investment Funds - Debt Securities |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Carrying Value |  | 30,132 | 31,366 |
Equity securities: |  |  |  |
Amortized Cost |  | 29,588 | 31,934 |
Unrealized gain (loss) on equity securities recognized through income |  | 544 | (568) |
Carrying Value |  | 30,132 | 31,366 |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |  |
Unrealized gain (loss) on equity securities recognized through income |  | 544 | (568) |
Common Stock and Stock Funds |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Carrying Value |  | 37,868 | 38,060 |
Equity securities: |  |  |  |
Amortized Cost |  | 34,941 | 39,731 |
Unrealized gain (loss) on equity securities recognized through income |  | 2,927 | (1,671) |
Carrying Value |  | 37,868 | 38,060 |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |  |
Unrealized gain (loss) on equity securities recognized through income |  | 2,927 | (1,671) |
U.S. Treasury Securities |  |  |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |  |
Available-for-sale, amortized cost |  | 2,421 | 8,983 |
Available-for-sale, gross unrealized gain (Loss) |  | 13 | (31) |
Available-for-sale, carrying value |  | 2,434 | 8,952 |
Investment-Grade Unsecured Bonds |  |  |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |  |
Available-for-sale, amortized cost |  | 1,048 | 4,125 |
Available-for-sale, gross unrealized gain (Loss) |  | 60 | (145) |
Available-for-sale, carrying value |  | 1,108 | 3,980 |
Mortgage Backed Securities |  |  |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |  |
Held to maturity, amortized cost |  | 72,651 | 127,187 |
Held to maturity, gross unrealized gain (loss) |  | 0 | 0 |
Held to maturity carrying value |  | $ 72,651 | $ 127,187 |

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