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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 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 2016-09 [Member] $ 0 $ 0 $ 0 $ (8,486) $ 0 $ 0 $ (8,486)
Beginning balance at Dec. 31, 2016 $ 5,978 432,459 (51,007) 2,342,236 $ (320,348) 3,549 2,412,867
Beginning balance (in shares) at Dec. 31, 2016 59,776       (5,921)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock option exercises $ 0 (531) 0 0 $ 3,603 0 3,072
Stock option exercises (in shares) 0       69    
Issuance of shares in acquisition $ 569 365,985 0 0 $ 0 0 366,554
Issuance of shares in acquisition (in shares) 5,696       0    
Issuance of stock for equity awards, net of forfeitures $ 0 (6,406) 0 0 $ 6,406 0 0
Issuance of stock for equity awards, net of forfeitures (in shares) 0       113    
Tax withholdings on equity award vesting $ 0 0 0 0 $ (2,881) 0 (2,881)
Tax withholdings on equity award vesting (in shares) 0       (44)    
Amortization of unearned share-based compensation $ 0 11,460 0 0 $ 0 0 11,460
Total comprehensive income, net of taxes 0 0 18,602 313,187 0 716 332,505
Acquisitions of noncontrolling interests 0 (6) 0 0 0 0 (6)
Return of investment to noncontrolling interests 0 0 0 0 0 (862) (862)
Ending balance at Dec. 31, 2017 $ 6,547 802,961 (32,405) 2,646,937 $ (313,220) 3,403 3,114,223
Ending balance (in shares) at Dec. 31, 2017 65,472       (5,783)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Adoption of new accounting standards | ASC 606 [Member] $ 0 0 0 (9,722) $ 0 0 (9,722)
Adoption of new accounting standards | ASU 2018-02 [Member] 0 0 0 7,925 0 0 7,925
Stock option exercises $ 0 2,161 0 0 $ 11,151 0 13,312
Stock option exercises (in shares) 0       232    
Issuance of stock for equity awards, net of forfeitures $ 0 (879) 0 0 $ 879 0 0
Issuance of stock for equity awards, net of forfeitures (in shares) 0       15    
Tax withholdings on equity award vesting $ 0 0 0 0 $ (4,822) 0 (4,822)
Tax withholdings on equity award vesting (in shares) 0       (61)    
Amortization of unearned share-based compensation $ 0 19,104 0 0 $ 0 0 19,104
Total comprehensive income, net of taxes 0 0 (1,106) 78,452 0 626 77,972
Treasury stock purchases $ 0 0 0 0 $ (776) 0 (776)
Treasury stock purchases (in shares) 0       (11)    
Return of investment to noncontrolling interests $ 0 0 0 0 $ 0 (915) (915)
Ending balance at Dec. 31, 2018 $ 6,547 823,347 (33,511) 2,723,592 $ (306,788) 3,114 3,216,301
Ending balance (in shares) at Dec. 31, 2018 65,472       (5,608)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Adoption of new accounting standards | ASC 606 [Member]       (9,722)      
Stock option exercises $ 0 675 0 0 $ 5,121 0 5,796
Stock option exercises (in shares) 0       93    
Issuance of stock for equity awards, net of forfeitures $ 0 (1,735) 0 0 $ 1,735 0 0
Issuance of stock for equity awards, net of forfeitures (in shares) 0       32    
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 13,612 0 0 $ 0 0 13,612
Total comprehensive income, net of taxes 0 0 (4,288) 142,347 0 672 138,731
Return of investment to noncontrolling interests 0 0 0 0 0 (817) (817)
Ending balance at Dec. 31, 2019 $ 6,547 $ 835,899 $ (37,799) $ 2,865,939 $ (301,963) $ 2,969 $ 3,371,592
Ending balance (in shares) at Dec. 31, 2019 65,472       (5,513)