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Fair Value of Financial Instruments - Rollforward of Instruments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Financial Assets |  |  |  |
Beginning balance | $ 246,505 | $ 217,642 | $ 212,104 | $ 173,426
Transfers into Level 3 | 35,462 | 18,030 | 97,116 | 68,483
Transfers out of Level 3 | (880) | (6,755) | (19,151) | (6,755)
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | (161) | (55) | (1,875) | (712)
Net unrealized investment gains (losses) included in other comprehensive income | (187) | 2,882 | 5,748 | 7,666
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | (1,999) | 0 | (1,999) | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (13,659) | (6,802) | (26,862) | (17,166)
Ending balance | 265,081 | 224,942 | 265,081 | 224,942
Financial Liabilities |  |  |  |
Beginning balance | 67,995 | 47,706 | 59,393 | 39,021
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 | 2,587 | 68 | 6,133 | 2,066
Net unrealized investment gains (losses) included in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 3,752 | 6,710 | 10,538 | 15,194
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (1,348) | 695 | (3,078) | (1,102)
Ending balance | 72,986 | 55,179 | 72,986 | 55,179
Short-term Investments |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 0 | 0 | 751 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | (751) | 0
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
Municipal bonds |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 49,123 | 47,647 | 46,497 | 30,379
Transfers into Level 3 | 0 | 0 | 5,214 | 14,751
Transfers out of Level 3 | 0 | 0 | (5,557) | 0
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 | 382 | (2,361) | 3,540 | 420
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (293) | (120) | (482) | (384)
Ending balance | 49,212 | 45,166 | 49,212 | 45,166
Corporate bonds |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 77,052 | 73,408 | 60,191 | 67,575
Transfers into Level 3 | 23,501 | 10,375 | 55,420 | 21,451
Transfers out of Level 3 | 1 | (5,967) | (11,962) | (5,967)
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | (1) | 1 | (1) | (656)
Net unrealized investment gains (losses) included in other comprehensive income | (192) | 1,292 | 263 | 3,073
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | (1,999) | 0 | (1,999) | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (4,117) | (1,488) | (7,667) | (7,855)
Ending balance | 94,245 | 77,621 | 94,245 | 77,621
Mortgage-Backed Securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 120,324 | 96,581 | 104,659 | 75,466
Transfers into Level 3 | 11,961 | 7,655 | 36,482 | 32,281
Transfers out of Level 3 | (881) | (788) | (881) | (788)
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | (160) | (56) | (1,874) | (56)
Net unrealized investment gains (losses) included in other comprehensive income | (377) | 3,951 | 1,945 | 4,173
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (9,249) | (5,194) | (18,713) | (8,927)
Ending balance | 121,618 | 102,149 | 121,618 | 102,149
Total Fixed Maturity Securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 246,499 | 217,636 | 211,347 | 173,420
Transfers into Level 3 | 35,462 | 18,030 | 97,116 | 68,483
Transfers out of Level 3 | (880) | (6,755) | (18,400) | (6,755)
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | (161) | (55) | (1,875) | (712)
Net unrealized investment gains (losses) included in other comprehensive income | (187) | 2,882 | 5,748 | 7,666
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | (1,999) | 0 | (1,999) | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (13,659) | (6,802) | (26,862) | (17,166)
Ending balance | 265,075 | 224,936 | 265,075 | 224,936
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 | 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 | $ 6 | $ 6 | $ 6 | $ 6

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