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Fair Value of Financial Instruments - Rollforward of Instruments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Financial Assets |  |
Beginning balance | $ 230,257 | $ 212,104
Transfers into Level 3 | 25,600 | 50,171
Transfers out of Level 3 | 0 | (6,861)
Total gains or losses |  |
Net realized investment gains (losses) included in net income related to financial assets | 3 | 0
Net unrealized investment gains (losses) included in other comprehensive income | (1,466) | 1,196
Purchases | 0 | 0
Issuances | 0 | 0
Sales | (3) | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | (10,523) | (7,853)
Ending balance | 243,868 | 248,757
Financial Liabilities |  |
Beginning balance | 80,733 | 59,393
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Total gains or losses |  |
Net realized gains (losses) included in net income related to financial liabilities | (2,222) | 2,308
Net unrealized investment gains (losses) included in other comprehensive income |  | 0
Purchases |  | 0
Issuances | 1,332 | 3,389
Sales |  | 0
Settlements |  | 0
Paydowns, maturities and distributions | (1,357) | (829)
Ending balance | 78,486 | 64,261
Short-term Investments |  |
Financial Assets |  |
Beginning balance | 0 | 751
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | (751)
Total gains or losses |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | 0
Net unrealized investment gains (losses) included in other comprehensive income | 0 | 0
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | 0 | 0
Ending balance | 0 | 0
Municipal bonds |  |
Financial Assets |  |
Beginning balance | 49,328 | 46,497
Transfers into Level 3 | 0 | 5,214
Transfers out of Level 3 | 0 | 0
Total gains or losses |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | 0
Net unrealized investment gains (losses) included in other comprehensive income | 443 | 1,871
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | (23) | (120)
Ending balance | 49,748 | 53,462
Corporate bonds |  |
Financial Assets |  |
Beginning balance | 72,979 | 60,191
Transfers into Level 3 | 10,778 | 29,918
Transfers out of Level 3 | 0 | (6,110)
Total gains or losses |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | 0
Net unrealized investment gains (losses) included in other comprehensive income | (887) | 96
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | (4,090) | (1,600)
Ending balance | 78,780 | 82,495
Mortgage-Backed Securities |  |
Financial Assets |  |
Beginning balance | 107,944 | 104,659
Transfers into Level 3 | 14,822 | 15,039
Transfers out of Level 3 | 0 | 0
Total gains or losses |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | 0
Net unrealized investment gains (losses) included in other comprehensive income | (1,022) | (771)
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | (6,410) | (6,133)
Ending balance | 115,334 | 112,794
Total Fixed Maturity Securities |  |
Financial Assets |  |
Beginning balance | 230,251 | 211,347
Transfers into Level 3 | 25,600 | 50,171
Transfers out of Level 3 | 0 | (6,110)
Total gains or losses |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | 0
Net unrealized investment gains (losses) included in other comprehensive income | (1,466) | 1,196
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | (10,523) | (7,853)
Ending balance | 243,862 | 248,751
Equity securities |  |
Financial Assets |  |
Beginning balance | 6 | 6
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Total gains or losses |  |
Net realized investment gains (losses) included in net income related to financial assets | 3 | 0
Net unrealized investment gains (losses) included in other comprehensive income | 0 | 0
Purchases | 0 | 0
Issuances | 0 | 0
Sales | (3) | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | 0 | 0
Ending balance | $ 6 | $ 6

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