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CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Noncontrolling Interests [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2018 | $ 6,547 | $ 823,347 | $ (33,511) | $ 2,723,592 | $ (306,788) | $ 3,114 | $ 3,216,301
Beginning balance (in shares) at Dec. 31, 2018 | 65,472 |  |  |  | (5,608) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock option exercises | $ 0 | 355 | 0 | 0 | $ 3,263 | 0 | 3,618
Stock option exercises (in shares) | 0 |  |  |  | 60 |  |
Issuance of stock for equity awards, net of forfeitures | $ 0 | (1,889) | 0 | 0 | $ 1,889 | 0 | 0
Issuance of stock for equity awards, net of forfeitures (in shares) | 0 |  |  |  | 34 |  |
Tax withholdings on equity award vesting | $ 0 | 0 | 0 | 0 | $ (2,031) | 0 | (2,031)
Tax withholdings on equity award vesting (in shares) | 0 |  |  |  | (30) |  |
Amortization of unearned share-based compensation | $ 0 | 11,079 | 0 | 0 | $ 0 | 0 | 11,079
Total comprehensive income (loss), net of taxes | 0 | 0 | 6,098 | 139,570 | 0 | 477 | 146,145
Return of investment to noncontrolling interests | 0 | 0 | 0 | 0 | 0 | (614) | (614)
Ending balance at Sep. 30, 2019 | $ 6,547 | 832,892 | (27,413) | 2,863,162 | $ (303,667) | 2,977 | 3,374,498
Ending balance (in shares) at Sep. 30, 2019 | 65,472 |  |  |  | (5,544) |  |
Beginning balance at Jun. 30, 2019 | $ 6,547 | 829,460 | (26,967) | 2,815,175 | $ (305,061) | 3,018 | 3,322,172
Beginning balance (in shares) at Jun. 30, 2019 | 65,472 |  |  |  | (5,570) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock option exercises | $ 0 | 237 | 0 | 0 | $ 1,425 | 0 | 1,662
Stock option exercises (in shares) | 0 |  |  |  | 26 |  |
Issuance of stock for equity awards, net of forfeitures | $ 0 | 23 | 0 | 0 | $ (23) | 0 | 0
Issuance of stock for equity awards, net of forfeitures (in shares) | 0 |  |  |  | 0 |  |
Tax withholdings on equity award vesting | $ 0 | 0 | 0 | 0 | $ (8) | 0 | (8)
Tax withholdings on equity award vesting (in shares) | 0 |  |  |  | 0 |  |
Amortization of unearned share-based compensation | $ 0 | 3,172 | 0 | 0 | $ 0 | 0 | 3,172
Total comprehensive income (loss), net of taxes | 0 | 0 | (446) | 47,987 | 0 | 163 | 47,704
Return of investment to noncontrolling interests | 0 | 0 | 0 | 0 | 0 | (204) | (204)
Ending balance at Sep. 30, 2019 | $ 6,547 | 832,892 | (27,413) | 2,863,162 | $ (303,667) | 2,977 | 3,374,498
Ending balance (in shares) at Sep. 30, 2019 | 65,472 |  |  |  | (5,544) |  |
Beginning balance at Dec. 31, 2019 | $ 6,547 | 835,899 | (37,799) | 2,865,939 | $ (301,963) | 2,969 | 3,371,592
Beginning balance (in shares) at Dec. 31, 2019 | 65,472 |  |  |  | (5,513) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock option exercises | $ 0 | 26 | 0 | 0 | $ 327 | 0 | 353
Stock option exercises (in shares) | 0 |  |  |  | 15 |  |
Issuance of stock for equity awards, net of forfeitures | $ 0 | (5,690) | 0 | 0 | $ 5,690 | 0 | 0
Issuance of stock for equity awards, net of forfeitures (in shares) | 0 |  |  |  | 103 |  |
Tax withholdings on equity award vesting | $ 0 | 0 | 0 | 0 | $ (3,193) | 0 | (3,193)
Tax withholdings on equity award vesting (in shares) | 0 |  |  |  | (39) |  |
Amortization of unearned share-based compensation | $ 0 | 12,066 | 0 | 0 | $ 0 | 0 | 12,066
Total comprehensive income (loss), net of taxes | 0 | 0 | (7,836) | (294,750) | 0 | 743 | (301,843)
Return of investment to noncontrolling interests | 0 | 0 | 0 | 0 | 0 | (608) | (608)
Ending balance at Sep. 30, 2020 | $ 6,547 | 842,301 | (45,635) | 2,571,189 | $ (299,139) | 3,104 | 3,078,367
Ending balance (in shares) at Sep. 30, 2020 | 65,472 |  |  |  | (5,434) |  |
Beginning balance at Jun. 30, 2020 | $ 6,547 | 838,874 | (41,117) | 2,543,700 | $ (299,124) | 3,104 | 3,051,984
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 | $ 0 | 13 | 0 | 0 | $ (13) | 0 | 0
Issuance of stock for equity awards, net of forfeitures (in shares) | 0 |  |  |  | 0 |  |
Tax withholdings on equity award vesting | $ 0 | 0 | 0 | 0 | $ (2) | 0 | (2)
Tax withholdings on equity award vesting (in shares) | 0 |  |  |  | 0 |  |
Amortization of unearned share-based compensation | $ 0 | 3,414 | 0 | 0 | $ 0 | 0 | 3,414
Total comprehensive income (loss), net of taxes | 0 | 0 | (4,518) | 27,489 | 0 | 204 | 23,175
Return of investment to noncontrolling interests | 0 | 0 | 0 | 0 | 0 | (204) | (204)
Ending balance at Sep. 30, 2020 | $ 6,547 | $ 842,301 | $ (45,635) | $ 2,571,189 | $ (299,139) | $ 3,104 | $ 3,078,367
Ending balance (in shares) at Sep. 30, 2020 | 65,472 |  |  |  | (5,434) |  |

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