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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
--- | --- | ---
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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 125,329 | $ 26,551 | $ 2,261 | $ 15,318 | $ 19,823 | $ 26,923 | $ 11,866 | $ 25,153 | $ 21,040 | $ 21,984 | $ 16,183 | $ 34,275 | $ 169,459 | $ 83,765 | $ 93,482
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net realized investment (gains) losses |  |  |  |  |  |  |  |  |  |  |  |  | 3,406 | (4,123) | (12,713)
Increase in accrued investment income |  |  |  |  |  |  |  |  |  |  |  |  | (3,404) | (2,208) | (2,566)
Increase (decrease) in accrued expenses |  |  |  |  |  |  |  |  |  |  |  |  | (2,240) | 4,378 | (5,798)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 6,615 | 6,896 | 7,734
Increase in insurance liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 154,061 | 176,315 | 145,313
Increase in premium receivables |  |  |  |  |  |  |  |  |  |  |  |  | (12,917) | (11,496) | (8,641)
Increase in deferred policy acquisition costs |  |  |  |  |  |  |  |  |  |  |  |  | (7,967) | (15,859) | (8,981)
(Increase) decrease in reinsurance recoverables |  |  |  |  |  |  |  |  |  |  |  |  | 11 | (481) | (748)
(Decrease) increase in income tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  | (74,487) | (1,293) | 8,935
Debt retirement costs |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 2,338
Other |  |  |  |  |  |  |  |  |  |  |  |  | 24,049 | (24,461) | (10,641)
Total adjustments |  |  |  |  |  |  |  |  |  |  |  |  | 87,127 | 127,668 | 114,232
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  | $ 256,586 | $ 211,433 | $ 207,714

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of asset retirement obligations (ARO) costs incurred (whether capitalized or charged to expense) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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