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Supplementary Data on Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 19,823 | $ 26,923 | $ 11,866 | $ 25,153 | $ 21,040 | $ 21,984 | $ 16,183 | $ 34,275 | $ 30,068 | $ 25,357 | $ 20,452 | $ 28,366 | $ 83,765 | $ 93,482 | $ 104,243
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net realized investment gains |  |  |  |  |  |  |  |  |  |  |  |  | (4,123) | (12,713) | (10,917)
Increase in accrued investment income |  |  |  |  |  |  |  |  |  |  |  |  | (2,208) | (2,566) | (5,563)
Increase (decrease) in accrued expenses |  |  |  |  |  |  |  |  |  |  |  |  | 4,378 | (5,798) | 1,513
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 6,896 | 7,734 | 7,958
Increase in insurance liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 176,315 | 145,313 | 153,423
Increase in premium receivables |  |  |  |  |  |  |  |  |  |  |  |  | (11,496) | (8,641) | (3,638)
Increase in deferred policy acquisition costs |  |  |  |  |  |  |  |  |  |  |  |  | (15,859) | (8,981) | (12,662)
(Decrease) increase in reinsurance recoverables |  |  |  |  |  |  |  |  |  |  |  |  | (481) | (748) | 1,570
Increase in income tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  | (1,293) | 8,935 | 9,745
Debt retirement costs |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 2,338 | 0
Other |  |  |  |  |  |  |  |  |  |  |  |  | (28,476) | (11,312) | (23,739)
Total adjustments |  |  |  |  |  |  |  |  |  |  |  |  | 123,653 | 113,561 | 117,690
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  | $ 207,418 | $ 207,043 | $ 221,933

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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=66902209&loc=d3e3602-108585 + Details
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