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STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating activities |  |  |
Net income | $ 172,234 | $ 162,995 | $ 140,095
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 160,086 | 151,889 | 143,829
Deferred income taxes | 53,242 | 92,393 | 86,788
Share-based compensation expense | 8,195 | 8,876 | 11,219
Provision for doubtful accounts | 8,506 | 7,323 | 5,427
Changes in assets and liabilities: |  |  |
Accounts receivable | (5,159) | (15,147) | (80,028)
Materials and supplies | (4,661) | (5,588) | (759)
Income tax receivable | 0 | 0 | 37,480
Natural gas in storage | 22,859 | (4,722) | 16,721
Asset removal costs | (52,855) | (52,376) | (53,430)
Accounts payable | 36,885 | 1,945 | 27,596
Accrued interest | 148 | (78) | (19)
Accrued taxes other than income | 6,316 | (1,247) | 5,322
Accrued liabilities | 236 | 7,127 | (8,539)
Customer deposits | 372 | (398) | 884
Regulatory assets and liabilities | 109,437 | 29,250 | (49,472)
Employee benefit obligation | (50,100) | (118,095) | (25,666)
Other assets and liabilities | 1,953 | (10,347) | 33,141
Cash provided by operating activities | 467,694 | 253,800 | 290,589
Investing activities |  |  |
Capital expenditures | (394,450) | (356,361) | (309,071)
Other | 0 | 618 | 492
Cash used in investing activities | (394,450) | (355,743) | (308,579)
Financing activities |  |  |
Borrowings (repayment) on notes payable, net | (57,715) | 212,215 | 132,500
Repurchase of common stock | 0 | (17,512) | (24,066)
Proceeds from Issuance of Long-term Debt | 395,648 | 0 | 0
Payments of Financing Costs | 4,324 | 0 | 0
Issuance of common stock | 4,803 | 4,457 | 4,017
Repayments of Long-term Debt | (300,000) | 0 | 0
Dividends paid | (96,594) | (87,951) | (73,209)
Tax withholdings related to net share settlements of stock compensation | (8,152) | (9,516) | (9,022)
Cash provided by (used in) financing activities | (66,334) | 101,693 | 30,220
Change in cash and cash equivalents | 6,910 | (250) | 12,230
Cash and cash equivalents at beginning of period | 14,413 | 14,663 | 2,433
Cash and cash equivalents at end of period | 21,323 | 14,413 | 14,663
Supplemental cash flow information: |  |  |
Cash paid for interest, net of amounts capitalized | 49,371 | 44,436 | 42,129
Cash received for income taxes, net | $ 800 | $ (1,389) | $ (35,702)

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- Definition The net cash inflow or cash outflow from issuing (borrowing) and repaying commercial paper. + 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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3098-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + 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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Amount of operating expense for depreciation and amortization of regulated operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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