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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net income | $ 164,822 | $ 159,256 | $ 96,749
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 42,770 | 35,731 | 26,701
Non-cash lease expense | 9,652 | 6,075 | 193
Amortization of customer contract intangible assets | 7,211 | 7,211 | 7,211
Amortization of deferred revenue | (1,953) | (1,888) | (1,688)
Amortization of deferred financing costs and debt discount | 3,016 | 2,412 | 2,629
Income from equity method investments | (24,575) | (22,693) | (19,832)
Dividends from equity method investments | 20,831 | 25,436 | 16,108
Other non-cash adjustments | 1,959 | 1,253 | 1,757
Changes in assets and liabilities: |  |  |
Accounts receivable | 292 | (2,472) | 8,382
Inventories and other current assets | 55 | 11,363 | (7,702)
Accounts payable and other current liabilities | (1,913) | (13,479) | (4,836)
Accounts receivable/payable to related parties | 67,161 | (14,628) | 1,065
Non-current assets and liabilities, net | (14,166) | (561) | 3,662
Net cash provided by operating activities | 275,162 | 193,016 | 130,399
Cash flows from investing activities: |  |  |
Asset acquisitions from Delek Holdings, net of assumed liabilities | 0 | (100,527) | 0
Purchases of property, plant and equipment and intangible assets | (24,016) | (13,284) | (9,070)
Proceeds from sales of property, plant and equipment | 275 | 107 | 144
Distributions from equity method investments | 8,774 | 2,741 | 804
Equity method investment contributions | (1,393) | (12,175) | (139,294)
Net cash used in investing activities | (16,360) | (123,138) | (147,416)
Cash flows from financing activities: |  |  |
Proceeds from issuance of additional units to maintain 2% general partner interest | 0 | 10 | 8
Distributions to general partner | 0 | (27,635) | (31,654)
Distributions to common unitholders - public | (32,462) | (31,532) | (30,626)
Distributions to common unitholders - Delek Holdings | (129,255) | (77,665) | (51,388)
Distributions to Delek Holdings unitholders and general partner related to Trucking Assets Acquisition | 0 | (47,558) | 0
Distribution to general partner for conversion of its interest and IDR elimination | 0 | (45,000) | 0
Proceeds from revolving credit facility | 341,000 | 599,600 | 564,700
Payments on revolving credit facility | (829,601) | (441,400) | (433,000)
Proceeds from issuance of senior notes | 400,000 | 0 | 0
Deferred financing costs paid in connection with debt issuances | (6,216) | 0 | 0
Payments on financing lease liabilities | (2,219) | 0 | 0
Net cash used in financing activities | (258,753) | (71,180) | 18,040
Net increase (decrease) in cash and cash equivalents | 49 | (1,302) | 1,023
Cash and cash equivalents at the beginning of the period | 4,243 | 5,545 | 4,522
Cash and cash equivalents at the end of the period | 4,292 | 4,243 | 5,545
Cash paid during the period for: |  |  |
Interest | 44,633 | 40,582 | 44,791
Income taxes | 34 | 98 | 144
Non-cash investing activities: |  |  |
Increase in accrued capital expenditures and other | 3,850 | 198 | 917
Equity issuance to Delek Holdings unitholders in connection with Permian Gathering Assets Acquisition | 0 | 109,513 | 0
Non-cash financing activities: |  |  |
Sponsor contribution of property, plant and equipment | 0 | 2,938 | 0
Non-cash lease liability arising from obtaining right of use assets during the period | 9,457 | 32,090 | 1,285
Non-cash lease liability arising from recognition of right of use assets upon adoption of ASU 2016-02 | $ 0 | $ 0 | $ 2,654

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