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Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net income | $ 672,682 | $ 615,518 | $ 605,668
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 261,267 | 253,681 | 230,357
Noncash lease expense | 11,963 | 11,066 |
Loss on disposal of property and equipment | 736 | 6,066 | 477
Deferred income taxes | (41,011) | 13,157 | 57,709
Share-based compensation | 11,337 | 16,717 | 4,894
Changes in assets and liabilities: |  |  |
Customer and other receivables, net | (49,045) | 30,330 | (34,666)
Prepaid expenses and other assets | (1,722) | (16,807) | (12,003)
Accounts payable | (1,743) | (8,264) | 4,789
Compensation, benefits and other accrued liabilities | 72,928 | 3,263 | 47,552
Claims and insurance accruals | (1,459) | 5,297 | 8,142
Income taxes, net | 8,750 | 32,612 | (17,813)
Other liabilities | (11,659) | 21,252 | 5,010
Net cash provided by operating activities | 933,024 | 983,888 | 900,116
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (225,081) | (479,325) | (588,292)
Proceeds from sale of property and equipment | 3,690 | 5,686 | 6,983
Purchase of short-term investments | (360,160) |  |
Proceeds from maturities of short-term investments | 29,988 |  |
Other investing activities, net | (100) |  | 918
Net cash used in investing activities | (551,663) | (473,639) | (580,391)
Cash flows from financing activities: |  |  |
Proceeds from issuance of long-term debt | 99,923 |  |
Principal payments under debt agreements | (45,000) |  | (50,000)
Dividends paid | (71,023) | (54,552) | (42,566)
Payments for share repurchases | (364,057) | (240,960) | (163,265)
Other financing activities, net | (3,345) | (1,448) | (1,074)
Net cash used in financing activities | (383,502) | (296,960) | (256,905)
(Decrease) increase in cash and cash equivalents | (2,141) | 213,289 | 62,820
Cash and cash equivalents at beginning of year | 403,571 | 190,282 | 127,462
Cash and cash equivalents at end of year | 401,430 | 403,571 | 190,282
Income taxes paid | 266,506 | 157,290 | 170,035
Interest paid | 5,686 | 3,857 | 4,525
Capitalized interest | $ 2,473 | $ 3,128 | $ 3,237

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