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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows - operating activities |  |  |
Premiums collected | $ 760,367 | $ 739,503 | $ 710,646
Policyholder benefits paid | (590,479) | (528,501) | (511,017)
Policy acquisition and other operating expenses paid | (305,000) | (283,351) | (277,076)
Income taxes paid | (8,679) | (16,259) | (27,847)
Investment income collected | 373,568 | 363,283 | 344,778
Interest expense paid | (12,532) | (11,555) | (11,754)
Other | (16,357) | (6,534) | (16,297)
Net cash provided by operating activities | 200,888 | 256,586 | 211,433
Fixed maturity securities |  |  |
Purchases | (1,428,889) | (1,569,220) | (1,566,047)
Sales | 625,527 | 500,760 | 429,251
Maturities, paydowns, calls and redemptions | 737,535 | 927,665 | 799,653
Equity securities |  |  |
Purchases | (13,430) | (32,312) | (60,135)
Sales and repayments | 25,498 | 53,100 | 21,210
Limited partnership interests |  |  |
Purchases | (93,545) | (103,200) | (70,177)
Sales | 16,997 | 20,234 | 12,418
Change in short-term and other investments, net | (56,192) | (25,691) | 108,467
Net cash used in investing activities | (186,499) | (228,664) | (325,360)
Cash flows - financing activities |  |  |
Dividends paid to shareholders | (46,689) | (46,114) | (44,310)
FHLB borrowings | 0 | 50,000 | 0
Acquisition of treasury stock | (5,088) | (1,660) | (21,513)
Proceeds from exercise of stock options | 3,627 | 4,190 | 3,329
Withholding tax payments on RSUs tendered | (3,165) | (3,245) | (4,015)
Annuity contracts: variable, fixed and FHLB funding agreements |  |  |
Deposits | 489,097 | 453,146 | 520,211
Benefits, withdrawals and net transfers to Separate Account (variable annuity) assets | (473,003) | (411,061) | (349,915)
Transfer of Company 401(k) to a third-party provider | 0 | (77,898) | 0
Life policy accounts |  |  |
Deposits | 8,149 | 4,883 | 4,018
Withdrawals and surrenders | (4,910) | (4,458) | (3,965)
Change in book overdrafts | 21,872 | (4,748) | 11,248
Net cash provided by (used in) financing activities | (10,110) | (36,965) | 115,088
Net increase (decrease) in cash | 4,279 | (9,043) | 1,161
Cash at beginning of period | 7,627 | 16,670 | 15,509
Cash at end of period | $ 11,906 | $ 7,627 | $ 16,670

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- Definition The cash outflow for an insurance contract under which the policy holder makes a lump sum payment or a series of payments in exchange for periodic payments to the policyholder beginning immediately or at some future date and net transfer to separate account (variable annuity) assets. + References No definition available. + Details
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- Definition The amount of cash paid for recurring costs associated with normal, ongoing operations as well as costs related to, and variable with, the selling of insurance policies and annuity contracts. + References No definition available. + Details
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- Definition The amount of cash paid to policyholders for claims under life, group, auto and home insurance policies. Includes cash paid for claim adjustment expenses (the expense incurred related to claims other than the actual loss, for example, legal fees). + References No definition available. + Details
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- Definition Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 + Details
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- Definition The cash inflow from an insurance contract under which the policy holder make a lump sum payment or a series of payments in exchange for periodic payments to the policyholder beginning immediately or at some future date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash outflow for a segregated fund account during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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