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CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income, Net [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Noncontrolling Interests [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2019 | $ 3,371,592 | $ 6,547 | $ 835,899 | $ (37,799) | $ 2,865,939 | $ (301,963) | $ 2,969
Beginning balance (in shares) at Dec. 31, 2019 |  | 65,472 |  |  |  | (5,513) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock option exercises | 353 |  | 26 | 0 | 0 | $ 327 | 0
Stock option exercises (in shares) |  |  |  |  |  | 15 |
Issuance of stock for equity awards, net of forfeitures | 0 |  | (5,690) | 0 | 0 | $ 5,690 | 0
Issuance of stock for equity awards, net of forfeitures (in shares) |  |  |  |  |  | 103 |
Tax withholdings on equity award vesting | (3,193) |  |  |  |  | $ (3,193) | 0
Tax withholdings on equity award vesting (in shares) |  |  |  |  |  | (39) |
Amortization of unearned share-based compensation | 12,066 |  | 12,066 | 0 | 0 | $ 0 | 0
Total comprehensive income (loss), net of taxes | (301,843) |  |  | (7,836) | (294,750) | 0 | 743
Return of investment to noncontrolling interests | (608) |  |  |  |  |  | (608)
Ending balance at Sep. 30, 2020 | 3,078,367 | $ 6,547 | 842,301 | (45,635) | 2,571,189 | $ (299,139) | 3,104
Ending balance (in shares) at Sep. 30, 2020 |  | 65,472 |  |  |  | (5,434) |
Beginning balance at Jun. 30, 2020 | 3,051,984 | $ 6,547 | 838,874 | (41,117) | 2,543,700 | $ (299,124) | 3,104
Beginning balance (in shares) at Jun. 30, 2020 |  | 65,472 |  |  |  | (5,434) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of stock for equity awards, net of forfeitures |  |  | 13 | 0 | 0 | $ (13) | 0
Issuance of stock for equity awards, net of forfeitures (in shares) |  |  |  |  |  | 0 |
Tax withholdings on equity award vesting | (2) |  |  |  |  | $ (2) |
Tax withholdings on equity award vesting (in shares) |  |  |  |  |  | 0 |
Amortization of unearned share-based compensation | 3,414 |  | 3,414 | 0 | 0 | $ 0 | 0
Total comprehensive income (loss), net of taxes | 23,175 |  |  | (4,518) | 27,489 | 0 | 204
Return of investment to noncontrolling interests | (204) |  |  |  |  |  | (204)
Ending balance at Sep. 30, 2020 | 3,078,367 | $ 6,547 | 842,301 | (45,635) | 2,571,189 | $ (299,139) | 3,104
Ending balance (in shares) at Sep. 30, 2020 |  | 65,472 |  |  |  | (5,434) |
Beginning balance at Dec. 31, 2020 | 3,087,553 | $ 6,547 | 844,979 | (61,452) | 2,593,393 | $ (299,161) | 3,247
Beginning balance (in shares) at Dec. 31, 2020 |  | 65,472 |  |  |  | (5,434) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock option exercises | 629 |  | 21 | 0 | 0 | $ 608 | 0
Stock option exercises (in shares) |  |  |  |  |  | 12 |
Issuance of stock for equity awards, net of forfeitures |  |  | (6,206) | 0 | 0 | $ 6,206 | 0
Issuance of stock for equity awards, net of forfeitures (in shares) |  |  |  |  |  | 113 |
Tax withholdings on equity award vesting | (2,856) |  |  |  |  | $ (2,856) | 0
Tax withholdings on equity award vesting (in shares) |  |  |  |  |  | (52) |
Amortization of unearned share-based compensation | 12,793 |  | 12,793 |  |  |  |
Total comprehensive income (loss), net of taxes | (251,131) |  |  | 6,789 | (257,915) |  | (5)
Return of investment to noncontrolling interests | (764) |  |  |  |  |  | (764)
Ending balance at Sep. 30, 2021 | 2,846,224 | $ 6,547 | 851,587 | (54,663) | 2,335,478 | $ (295,203) | 2,478
Ending balance (in shares) at Sep. 30, 2021 |  | 65,472 |  |  |  | (5,361) |
Beginning balance at Jun. 30, 2021 | 3,105,329 | $ 6,547 | 848,081 | (57,683) | 2,600,208 | $ (295,463) | 3,639
Beginning balance (in shares) at Jun. 30, 2021 |  | 65,472 |  |  |  | (5,366) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock option exercises | 124 |  | (9) | 0 | 0 | $ 133 | 0
Stock option exercises (in shares) |  |  |  |  |  | 2 |
Issuance of stock for equity awards, net of forfeitures |  |  | (130) | 0 | 0 | $ 130 | 0
Issuance of stock for equity awards, net of forfeitures (in shares) |  |  |  |  |  | 3 |
Tax withholdings on equity award vesting | (3) |  |  |  |  | $ (3) | 0
Tax withholdings on equity award vesting (in shares) |  |  |  |  |  | 0 |
Amortization of unearned share-based compensation | 3,645 |  | 3,645 | 0 | 0 |  |
Total comprehensive income (loss), net of taxes | (262,132) |  |  | 3,020 | (264,730) |  | (422)
Return of investment to noncontrolling interests | (739) |  |  |  |  |  | (739)
Ending balance at Sep. 30, 2021 | $ 2,846,224 | $ 6,547 | $ 851,587 | $ (54,663) | $ 2,335,478 | $ (295,203) | $ 2,478
Ending balance (in shares) at Sep. 30, 2021 |  | 65,472 |  |  |  | (5,361) |

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