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Fair Value of Financial Instruments - Rollforward of Instruments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Financial Assets |  |  |  |
Beginning balance | $ 243,868 | $ 248,757 | $ 230,257 | $ 212,104
Transfers into Level 3 | 48,031 | 11,483 | 73,631 | 61,654
Transfers out of Level 3 | (15,509) | (11,410) | (15,509) | (18,271)
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | (246) | (1,714) | (243) | (1,714)
Net unrealized investment gains (losses) included in other comprehensive income | 1,356 | 4,739 | (110) | 5,935
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | (3) | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (5,849) | (5,350) | (16,372) | (13,203)
Ending balance | 271,651 | 246,505 | 271,651 | 246,505
Financial Liabilities |  |  |  |
Beginning balance | 78,486 | 64,261 | 80,733 | 59,393
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Total gains or losses |  |  |  |
Net realized gains (losses) included in net income related to financial liabilities | (1,291) | 1,238 | (3,513) | 3,546
Net unrealized investment gains (losses) included in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 2,107 | 3,397 | 3,439 | 6,786
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (1,514) | (901) | (2,871) | (1,730)
Ending balance | 77,788 | 67,995 | 77,788 | 67,995
Short-term Investments |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 0 | 0 | 0 | 751
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | (751)
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | 0 | 0 | 0
Net unrealized investment gains (losses) included in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | 0 | 0 | 0 | 0
Ending balance | 0 | 0 | 0 | 0
Total Fixed Maturity Securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 243,862 | 248,751 | 230,251 | 211,347
Transfers into Level 3 | 48,031 | 11,483 | 73,631 | 61,654
Transfers out of Level 3 | (15,509) | (11,410) | (15,509) | (17,520)
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | (246) | (1,714) | (246) | (1,714)
Net unrealized investment gains (losses) included in other comprehensive income | 1,356 | 4,739 | (110) | 5,935
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (5,849) | (5,350) | (16,372) | (13,203)
Ending balance | 271,645 | 246,499 | 271,645 | 246,499
Municipal bonds |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 49,748 | 53,462 | 49,328 | 46,497
Transfers into Level 3 | 0 | 0 | 0 | 5,214
Transfers out of Level 3 | 0 | (5,557) | 0 | (5,557)
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | 0 | 0 | 0
Net unrealized investment gains (losses) included in other comprehensive income | 397 | 1,287 | 840 | 3,158
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (224) | (69) | (247) | (189)
Ending balance | 49,921 | 49,123 | 49,921 | 49,123
Corporate bonds |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 78,780 | 82,495 | 72,979 | 60,191
Transfers into Level 3 | 29,709 | 2,001 | 40,487 | 31,919
Transfers out of Level 3 | (11,279) | (5,853) | (11,279) | (11,963)
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | (246) | 0 | (246) | 0
Net unrealized investment gains (losses) included in other comprehensive income | (700) | 359 | (1,587) | 455
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (3,601) | (1,950) | (7,691) | (3,550)
Ending balance | 92,663 | 77,052 | 92,663 | 77,052
Mortgage-Backed Securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 115,334 | 112,794 | 107,944 | 104,659
Transfers into Level 3 | 18,322 | 9,482 | 33,144 | 24,521
Transfers out of Level 3 | (4,230) | 0 | (4,230) | 0
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | (1,714) | 0 | (1,714)
Net unrealized investment gains (losses) included in other comprehensive income | 1,659 | 3,093 | 637 | 2,322
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (2,024) | (3,331) | (8,434) | (9,464)
Ending balance | 129,061 | 120,324 | 129,061 | 120,324
Equity securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 6 | 6 | 6 | 6
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | 0 | 3 | 0
Net unrealized investment gains (losses) included in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | (3) | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | 0 | 0 | 0 | 0
Ending balance | $ 6 | $ 6 | $ 6 | $ 6

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