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Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |
Net income | $ 615,518 | $ 605,668 | $ 463,774
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 253,681 | 230,357 | 205,763
Noncash lease expense | 11,066 |  |
Loss on disposal of property and equipment | 6,066 | 477 | 1,274
Deferred income taxes | 13,157 | 57,709 | (82,639)
Share-based compensation | 16,717 | 4,894 | 3,242
Changes in assets and liabilities: |  |  |
Customer and other receivables, net | 30,330 | (34,666) | (76,353)
Prepaid expenses and other assets | (16,807) | (12,003) | (12,885)
Accounts payable | (8,264) | 4,789 | (15,487)
Compensation, benefits and other accrued liabilities | 3,263 | 47,552 | 25,330
Claims and insurance accruals | 5,297 | 8,142 | 1,843
Income taxes, net | 32,612 | (17,813) | (4,939)
Other liabilities | 21,252 | 5,010 | 27,371
Net cash provided by operating activities | 983,888 | 900,116 | 536,294
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (479,325) | (588,292) | (382,125)
Proceeds from sale of property and equipment | 5,686 | 6,983 | 12,240
Other investing activities, net |  | 918 | 2,139
Net cash used in investing activities | (473,639) | (580,391) | (367,746)
Cash flows from financing activities: |  |  |
Principal payments under long-term debt agreements |  | (50,000) |
Net payments on revolving line of credit |  |  | (9,975)
Dividends paid | (54,552) | (42,566) | (32,925)
Payments for share repurchases | (240,960) | (163,265) | (8,013)
Other financing activities, net | (1,448) | (1,074) | (344)
Net cash used in financing activities | (296,960) | (256,905) | (51,257)
Increase in cash and cash equivalents | 213,289 | 62,820 | 117,291
Cash and cash equivalents at beginning of year | 190,282 | 127,462 | 10,171
Cash and cash equivalents at end of year | 403,571 | 190,282 | 127,462
Income taxes paid | 157,290 | 170,035 | 199,404
Interest paid | 3,857 | 4,525 | 5,442
Capitalized interest | $ 3,128 | $ 3,237 | $ 3,309

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