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Supplementary Data on Cash Flows (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 34,287 | $ 23,599 | $ 25,995 | $ 27,012 | $ 31,826 | $ 32,266 | $ 13,103 | $ 26,671 | $ 32,913 | $ 23,637 | $ (11,851) | $ 25,807 | $ 110,893 | $ 103,866 | $ 70,506
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized investment gains |  |  |  |  |  |  |  |  |  |  |  |  | (22,245) | (27,298) | (37,663)
Increase in accrued investment income |  |  |  |  |  |  |  |  |  |  |  |  | (1,898) | (2,618) | (7,348)
Increase (decrease) in accrued expenses |  |  |  |  |  |  |  |  |  |  |  |  | 1,157 | 13,589 | (9,203)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 7,680 | 7,892 | 8,577
Increase in insurance liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 143,542 | 127,992 | 105,576
Increase in premium receivables |  |  |  |  |  |  |  |  |  |  |  |  | (4,018) | (5,638) | (1,263)
Increase in deferred policy acquisition costs |  |  |  |  |  |  |  |  |  |  |  |  | (14,659) | (13,989) | (6,258)
(Increase) decrease in reinsurance recoverable |  |  |  |  |  |  |  |  |  |  |  |  | (1,289) | 872 | (2,877)
Increase in income tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 7,099 | 29,752 | 17,953
Other |  |  |  |  |  |  |  |  |  |  |  |  | (20,326) | (31,572) | (22,121)
Total adjustments |  |  |  |  |  |  |  |  |  |  |  |  | 95,043 | 98,982 | 45,373
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  | $ 205,936 | $ 202,848 | $ 115,879

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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=31042434&loc=d3e3602-108585 + Details
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- Definition Total net Increase or Decrease in changes to deferred policy acquisition costs due to one or more transactions, including amortization of costs and modifications or internal replacements of existing insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6967983&loc=d3e11264-158415 + Details
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