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Organization and Basis of Presentation - Summary of Financial Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Equity securities: |  |  |
Gross Unrealized Gain (Loss) | $ 4,280 | $ 426 |
Carrying Value | 4,900 |  | $ 6,700
Held to maturity |  |  |
Equity and Debt Securities, Amortized Cost | 214,858 |  | 211,960
Equity and Debt Securities, Gross Unrealized Gain (Loss) | 2,036 |  | (2,415)
Equity and Debt Securities, Marketable Securities | 216,894 |  | 209,545
Investment funds - debt securities [Member] |  |  |
Equity securities: |  |  |
Amortized Cost/Cost | 27,883 |  | 31,934
Gross Unrealized Gain (Loss) | 576 |  | (568)
Carrying Value | 28,459 |  | 31,366
Common stock and stock funds [Member] |  |  |
Equity securities: |  |  |
Amortized Cost/Cost | 37,123 |  | 39,731
Gross Unrealized Gain (Loss) | 1,465 |  | (1,671)
Carrying Value | 38,588 |  | 38,060
Investment funds - U.S. treasuries [Member] |  |  |
Available for sale |  |  |
Amortized Cost/Cost | 4,915 |  | 8,983
Gross Unrealized Gain (Loss) | (15) |  | (31)
Carrying Value | 4,900 |  | 8,952
Investment-grade unsecured bonds [Member] |  |  |
Available for sale |  |  |
Amortized Cost/Cost | 1,048 |  | 4,125
Gross Unrealized Gain (Loss) | 10 |  | (145)
Carrying Value | 1,058 |  | 3,980
Mortgage backed securities [Member] |  |  |
Held to maturity |  |  |
Amortized Cost/Cost | 143,889 |  | 127,187
Gross Unrealized Gain (Loss) | 0 |  | 0
Carrying Value | $ 143,889 |  | $ 127,187

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