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Supplementary Data on Cash Flows - Reconciliation of Net Income to Cash Provided by Operating Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ (20,257) | $ 12,528 | $ 5,917 | $ 20,155 | $ 125,329 | $ 26,551 | $ 2,261 | $ 15,318 | $ 19,823 | $ 26,923 | $ 11,866 | $ 25,153 | $ 18,343 | $ 169,459 | $ 83,765
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment (gains) losses |  |  |  |  |  |  |  |  |  |  |  |  | 12,543 | 3,406 | (4,123)
Increase in accrued investment income |  |  |  |  |  |  |  |  |  |  |  |  | 4,449 | (3,404) | (2,208)
Increase (decrease) in accrued expenses |  |  |  |  |  |  |  |  |  |  |  |  | (1,088) | (2,240) | 4,378
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 7,357 | 6,615 | 6,896
Increase in insurance liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 197,472 | 154,061 | 176,315
Increase in premium receivables |  |  |  |  |  |  |  |  |  |  |  |  | (10,026) | (12,917) | (11,496)
Increase in deferred policy acquisition costs |  |  |  |  |  |  |  |  |  |  |  |  | (783) | (7,967) | (15,859)
(Increase) decrease in reinsurance recoverables |  |  |  |  |  |  |  |  |  |  |  |  | (21,317) | 11 | (481)
Increase (decrease) in income tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 5,971 | (21,291) | (1,293)
Other |  |  |  |  |  |  |  |  |  |  |  |  | (12,033) | (29,147) | (24,461)
Total adjustments |  |  |  |  |  |  |  |  |  |  |  |  | 182,545 | 87,127 | 127,668
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,888 | $ 256,586 | $ 211,433

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- Definition The sum of adjustments which are added to or deducted from net income or loss, including the portion attributable to noncontrolling interest, to reflect cash provided by or used in operating activities, in accordance with the indirect cash flow method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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