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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
--- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Adoption of new accounting standards | ASU 2018-02 [Member] | $ 0 | $ 0 | $ 0 | $ (1,797) | $ 0 | $ 0 | $ (1,797)
Beginning balance at Dec. 31, 2017 | $ 6,547 | 802,961 | (32,405) | 2,646,937 | $ (313,220) | 3,403 | 3,114,223
Beginning balance (in shares) at Dec. 31, 2017 | 65,472 |  |  |  | (5,783) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock option exercises | $ 0 | 2,111 | 0 | 0 | $ 10,923 | 0 | 13,034
Stock option exercises (in shares) | 0 |  |  |  | 228 |  |
Issuance of stock for equity awards | $ 0 | (1,014) | 0 | 0 | $ 1,014 | 0 | 0
Issuance of stock for equity awards (in shares) | 0 |  |  |  | 18 |  |
Tax withholdings on equity award vesting | $ 0 | 0 | 0 | 0 | $ (4,814) | 0 | (4,814)
Tax withholdings on equity award vesting (in shares) | 0 |  |  |  | (61) |  |
Amortization of unearned share-based compensation | $ 0 | 13,551 | 0 | 0 | $ 0 | 0 | 13,551
Total comprehensive income, net of taxes | 0 | 0 | (7,517) | 61,073 | 0 | 386 | 53,942
Return of investment to noncontrolling interests | 0 | 0 | 0 | 0 | 0 | (448) | (448)
Ending balance at Jun. 30, 2018 | $ 6,547 | 817,609 | (39,922) | 2,706,213 | $ (306,097) | 3,341 | 3,187,691
Ending balance (in shares) at Jun. 30, 2018 | 65,472 |  |  |  | (5,598) |  |
Beginning balance at Mar. 31, 2018 | $ 6,547 | 810,381 | (39,480) | 2,677,611 | $ (316,564) | 3,373 | 3,141,868
Beginning balance (in shares) at Mar. 31, 2018 | 65,472 |  |  |  | (5,800) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock option exercises | $ 0 | 2,242 | 0 | 0 | $ 10,501 | 0 | 12,743
Stock option exercises (in shares) | 0 |  |  |  | 196 |  |
Issuance of stock for equity awards | $ 0 | (1,014) | 0 | 0 | $ 1,014 | 0 | 0
Issuance of stock for equity awards (in shares) | 0 |  |  |  | 18 |  |
Tax withholdings on equity award vesting | $ 0 | 0 | 0 | 0 | $ (1,048) | 0 | (1,048)
Tax withholdings on equity award vesting (in shares) | 0 |  |  |  | (12) |  |
Amortization of unearned share-based compensation | $ 0 | 6,000 | 0 | 0 | $ 0 | 0 | 6,000
Total comprehensive income, net of taxes | 0 | 0 | (442) | 28,602 | 0 | 191 | 28,351
Return of investment to noncontrolling interests | 0 | 0 | 0 | 0 | 0 | (223) | (223)
Ending balance at Jun. 30, 2018 | $ 6,547 | 817,609 | (39,922) | 2,706,213 | $ (306,097) | 3,341 | 3,187,691
Ending balance (in shares) at Jun. 30, 2018 | 65,472 |  |  |  | (5,598) |  |
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 | $ 0 | (1,912) | 0 | 0 | $ 1,912 | 0 | 0
Issuance of stock for equity awards (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, 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 | $ 0 | (1,110) | 0 | 0 | $ 1,110 | 0 | 0
Issuance of stock for equity awards (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, 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) |  |

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