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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 68,854 | $ 317,149 | $ 149,019 | $ 22,791 | $ 30,949 | $ 319,885 | $ 171,612 | $ 8,094 | $ 557,813 | $ 530,540 | $ 507,949
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 664,140 | 650,955 | 610,629
Deferred income taxes |  |  |  |  |  |  |  |  | (1,479) | 117,355 | 248,164
Accounts receivable |  |  |  |  |  |  |  |  | (12,789) | 37,530 | (93,797)
Accounts payable |  |  |  |  |  |  |  |  | 50,641 | (14,602) | (23,769)
Net cash flow provided by operating activities |  |  |  |  |  |  |  |  | 956,726 | 1,277,144 | 1,118,036
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Net cash flow used for investing activities |  |  |  |  |  |  |  |  | (1,130,977) | (1,192,824) | (1,428,537)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Issuance of long-term debt |  |  |  |  |  |  |  |  | 1,092,188 | 445,245 | 848,239
Short-term debt borrowings under revolving credit facility |  |  |  |  |  |  |  |  | 49,000 | 45,000 | 58,000
Short-term debt repayments under revolving credit facility |  |  |  |  |  |  |  |  | (65,000) | (57,000) | (32,000)
Dividends paid on common stock |  |  |  |  |  |  |  |  | (329,643) | (308,892) | (289,793)
Repayment of long-term debt |  |  |  |  |  |  |  |  | (600,000) | (182,000) | (125,000)
Common stock equity issuance and purchases - net |  |  |  |  |  |  |  |  | 692 | (5,055) | (13,390)
Net cash flow provided by (used for) financing activities |  |  |  |  |  |  |  |  | 178,768 | (92,446) | 315,512
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  | 4,517 | (8,126) | 5,011
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  |  |  | 5,766 |  |  |  | 13,892 | 5,766 | 13,892 | 8,881
CASH AND CASH EQUIVALENTS AT END OF YEAR | 10,283 |  |  |  | 5,766 |  |  |  | 10,283 | 5,766 | 13,892
Pinnacle West |  |  |  |  |  |  |  |  |  |  |
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 538,320 | 511,047 | 488,456
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries - net |  |  |  |  |  |  |  |  | (562,946) | (569,249) | (507,495)
Depreciation and amortization |  |  |  |  |  |  |  |  | 76 | 76 | 76
Deferred income taxes |  |  |  |  |  |  |  |  | (35,831) | 49,535 | (264)
Accounts receivable |  |  |  |  |  |  |  |  | 182 | (7,881) | (2,106)
Accounts payable |  |  |  |  |  |  |  |  | (2,129) | 1,967 | (11,162)
Accrued taxes and income tax receivable - net |  |  |  |  |  |  |  |  | 16,400 | (13,535) | (22,247)
Dividends received from subsidiaries |  |  |  |  |  |  |  |  | 336,300 | 316,000 | 296,800
Other |  |  |  |  |  |  |  |  | (1,300) | 31,807 | 15,092
Net cash flow provided by operating activities |  |  |  |  |  |  |  |  | 289,072 | 319,767 | 257,150
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Investments in subsidiaries |  |  |  |  |  |  |  |  | 1,557 | (142,796) | (178,027)
Repayments of loans from subsidiaries |  |  |  |  |  |  |  |  | 4,190 | 6,477 | 2,987
Advances of loans to subsidiaries |  |  |  |  |  |  |  |  | (4,165) | (500) | (6,388)
Net cash flow used for investing activities |  |  |  |  |  |  |  |  | 1,582 | (136,819) | (181,428)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Issuance of long-term debt |  |  |  |  |  |  |  |  | 0 | 150,000 | 298,761
Short-term debt borrowings under revolving credit facility |  |  |  |  |  |  |  |  | 49,000 | 20,000 | 58,000
Short-term debt repayments under revolving credit facility |  |  |  |  |  |  |  |  | (65,000) | (32,000) | (32,000)
Commercial paper - net |  |  |  |  |  |  |  |  | 54,275 | (7,000) | 27,700
Dividends paid on common stock |  |  |  |  |  |  |  |  | (329,643) | (308,892) | (289,793)
Repayment of long-term debt |  |  |  |  |  |  |  |  | 0 | 0 | (125,000)
Common stock equity issuance and purchases - net |  |  |  |  |  |  |  |  | 692 | (5,055) | (13,390)
Other |  |  |  |  |  |  |  |  | 0 | (1) | 0
Net cash flow provided by (used for) financing activities |  |  |  |  |  |  |  |  | (290,676) | (182,948) | (75,722)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  | (22) | 0 | 0
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  |  |  | $ 41 |  |  |  | $ 41 | 41 | 41 | 41
CASH AND CASH EQUIVALENTS AT END OF YEAR | $ 19 |  |  |  | $ 41 |  |  |  | $ 19 | $ 41 | $ 41

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