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STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Document Fiscal Year Focus | 2018 |
Operating activities |  |
Net income | $ 111,254 | $ 97,079
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 78,647 | 74,870
Deferred income taxes | 30,546 | 50,308
Share-based compensation expense | 4,080 | 4,951
Provision for doubtful accounts | 4,071 | 3,501
Changes in assets and liabilities: |  |
Accounts receivable | 130,730 | 135,165
Materials and supplies | 3,548 | (2,792)
Natural gas in storage | 49,672 | 10,436
Asset removal costs | (25,774) | (22,837)
Accounts payable | (68,428) | (68,992)
Accrued interest | 252 | 104
Accrued taxes other than income | (6,393) | (9,009)
Accrued liabilities | (9,334) | (6,729)
Customer deposits | 438 | (686)
Regulatory assets and liabilities | 105,967 | 19,782
Other assets and liabilities | (9,319) | (5,880)
Cash provided by operating activities | 399,957 | 279,271
Investing activities |  |
Capital expenditures | (175,834) | (154,666)
Other | 0 | 477
Cash used in investing activities | (175,834) | (154,189)
Financing activities |  |
Repayments of notes payable, net | (172,215) | (66,000)
Repurchase of common stock | 0 | (17,512)
Issuance of common stock | 2,390 | 2,208
Dividends paid | (48,272) | (44,042)
Tax withholdings related to net share settlements of stock compensation | (7,859) | (9,286)
Cash used in financing activities | (225,956) | (134,632)
Change in cash and cash equivalents | (1,833) | (9,550)
Cash and cash equivalents at beginning of period | 14,413 | 14,663
Cash and cash equivalents at end of period | $ 12,580 | $ 5,113

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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