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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, Net 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 | 118 | 0 | 0 | $ 1,838 | 0 | 1,956
Stock option exercises (in shares) | 0 |  |  |  | 34 |  |
Issuance of stock for equity awards, net of forfeitures | $ 0 | (1,912) | 0 | 0 | $ 1,912 | 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 | $ (2,023) | 0 | (2,023)
Tax withholdings on equity award vesting (in shares) | 0 |  |  |  | (30) |  |
Amortization of unearned share-based compensation | $ 0 | 7,907 | 0 | 0 | $ 0 | 0 | 7,907
Total comprehensive income (loss), net of taxes | 0 | 0 | 6,544 | 91,583 | 0 | 314 | 98,441
Return of investment to noncontrolling interests | 0 | 0 | 0 | 0 | 0 | (410) | (410)
Ending balance at Jun. 30, 2019 | $ 6,547 | 829,460 | (26,967) | 2,815,175 | $ (305,061) | 3,018 | 3,322,172
Ending balance (in shares) at Jun. 30, 2019 | 65,472 |  |  |  | (5,570) |  |
Beginning balance at Mar. 31, 2019 | $ 6,547 | 827,497 | (32,971) | 2,767,888 | $ (306,625) | 3,072 | 3,265,408
Beginning balance (in shares) at Mar. 31, 2019 | 65,472 |  |  |  | (5,599) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock option exercises | $ 0 | 66 | 0 | 0 | $ 474 | 0 | 540
Stock option exercises (in shares) | 0 |  |  |  | 9 |  |
Issuance of stock for equity awards, net of forfeitures | $ 0 | (1,110) | 0 | 0 | $ 1,110 | 0 | 0
Issuance of stock for equity awards, net of forfeitures (in shares) | 0 |  |  |  | 20 |  |
Tax withholdings on equity award vesting | $ 0 | 0 | 0 | 0 | $ (20) | 0 | (20)
Tax withholdings on equity award vesting (in shares) | 0 |  |  |  | 0 |  |
Amortization of unearned share-based compensation | $ 0 | 3,007 | 0 | 0 | $ 0 | 0 | 3,007
Total comprehensive income (loss), net of taxes | 0 | 0 | 6,004 | 47,287 | 0 | 153 | 53,444
Return of investment to noncontrolling interests | 0 | 0 | 0 | 0 | 0 | (207) | (207)
Ending balance at Jun. 30, 2019 | $ 6,547 | 829,460 | (26,967) | 2,815,175 | $ (305,061) | 3,018 | 3,322,172
Ending balance (in shares) at Jun. 30, 2019 | 65,472 |  |  |  | (5,570) |  |
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 | (5,703) | 0 | 0 | $ 5,703 | 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 | $ (3,191) | 0 | (3,191)
Tax withholdings on equity award vesting (in shares) | 0 |  |  |  | (39) |  |
Amortization of unearned share-based compensation | $ 0 | 8,652 | 0 | 0 | $ 0 | 0 | 8,652
Total comprehensive income (loss), net of taxes | 0 | 0 | (3,318) | (322,239) | 0 | 539 | (325,018)
Return of investment to noncontrolling interests | 0 | 0 | 0 | 0 | 0 | (404) | (404)
Ending balance at Jun. 30, 2020 | $ 6,547 | 838,874 | (41,117) | 2,543,700 | $ (299,124) | 3,104 | 3,051,984
Ending balance (in shares) at Jun. 30, 2020 | 65,472 |  |  |  | (5,434) |  |
Beginning balance at Mar. 31, 2020 | $ 6,547 | 837,879 | (38,991) | 2,518,698 | $ (301,424) | 3,045 | 3,025,754
Beginning balance (in shares) at Mar. 31, 2020 | 65,472 |  |  |  | (5,475) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of stock for equity awards, net of forfeitures | $ 0 | (2,326) | 0 | 0 | $ 2,326 | 0 | 0
Issuance of stock for equity awards, net of forfeitures (in shares) | 0 |  |  |  | 42 |  |
Tax withholdings on equity award vesting | $ 0 | 0 | 0 | 0 | $ (26) | 0 | (26)
Tax withholdings on equity award vesting (in shares) | 0 |  |  |  | (1) |  |
Amortization of unearned share-based compensation | $ 0 | 3,321 | 0 | 0 | $ 0 | 0 | 3,321
Total comprehensive income (loss), net of taxes | 0 | 0 | (2,126) | 25,002 | 0 | 261 | 23,137
Return of investment to noncontrolling interests | 0 | 0 | 0 | 0 | 0 | (202) | (202)
Ending balance at Jun. 30, 2020 | $ 6,547 | $ 838,874 | $ (41,117) | $ 2,543,700 | $ (299,124) | $ 3,104 | $ 3,051,984
Ending balance (in shares) at Jun. 30, 2020 | 65,472 |  |  |  | (5,434) |  |

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