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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Cash flows from operating activities: |  |
Net cash provided by (used in) operating activities | $ 158,081 | $ 140,965
Cash flows from investing activities: |  |
Proceeds from sale of property and equipment | 17 | 15
Purchases of property and equipment | (4,024) | (2,757)
Purchases of equity securities | (19,106) | (13,275)
Purchases of available-for-sale debt securities | (205,738) | (67,517)
Purchases of investment real estate, net | (1,269) | (3,759)
Proceeds from sales of equity securities | 4,127 | 56,971
Proceeds from sales of available-for-sale debt securities | 119,222 | 6,507
Maturities of available-for-sale debt securities | 64,480 | 39,144
Maturities of available-for-sale short-term investments | 10,000 | 5,000
Net cash provided by (used in) investing activities | (32,291) | 20,329
Cash flows from financing activities: |  |
Preferred stock dividend | (5) | (5)
Common stock dividend | (9,821) | (9,803)
Issuance of common stock for stock option exercises | 73 |
Purchase of treasury stock | (11,116) | (8,919)
Payments related to tax withholding for share-based compensation | (6,583) | (1,367)
Repayment of debt | (736) | (1,435)
Net cash provided by (used in) financing activities | (28,188) | (21,529)
Cash and cash equivalents, and restricted cash and cash equivalents: |  |
Net increase (decrease) during the period | 97,602 | 139,765
Balance, beginning of period | 216,121 | 108,365
Balance, end of period | $ 313,723 | $ 248,130

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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