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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Class A Common Stock
Common Stock
Preferred Stock
Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income
Total
Balance at Dec. 31, 2016 $ 1,010   $ 2,237,866 $ 1,143,311   $ 3,382,187
Balance (in shares) at Dec. 31, 2016 102,844,477          
Increase (Decrease) in Shareholders' Equity            
Cumulative effect of adjustment upon adoption of ASU 2016-09       458   458
Issuance of common stock upon exercise of options and warrants, vesting of restricted stock units and convertible debt conversion $ 26   9,320     9,346
Issuance of common stock upon exercise of options and warrants, vesting of restricted stock units and convertible debt conversion (in shares) 942,088          
Stock-based compensation expense     19,804     19,804
Cash dividends       (33,579)   (33,579)
Tax withholding on stock based compensation     (6,926)     (6,926)
Tax withholding on stock based compensation (in shares) (164,936)          
Net income       756,152   756,152
Balance at Dec. 31, 2017 $ 1,036   2,260,064 1,866,342   4,127,442
Balance (in shares) at Dec. 31, 2017 103,621,629          
Increase (Decrease) in Shareholders' Equity            
Issuance of common stock upon exercise of options and warrants, vesting of restricted stock units and convertible debt conversion $ 75   204,244     204,319
Issuance of common stock upon exercise of options and warrants, vesting of restricted stock units and convertible debt conversion (in shares) 7,497,770          
Stock-based compensation expense     17,478     17,478
Cash dividends       (45,625)   (45,625)
Tax withholding on stock based compensation $ (1)   (7,548)     (7,549)
Tax withholding on stock based compensation (in shares) (169,549)          
Net income       510,835   510,835
Balance at Dec. 31, 2018 $ 1,110   2,474,238 2,331,552   4,806,900
Balance (in shares) at Dec. 31, 2018 110,949,850          
Increase (Decrease) in Shareholders' Equity            
Issuance of common stock upon exercise of options and warrants, vesting of restricted stock units and convertible debt conversion $ 25   44,860     44,885
Issuance of common stock upon exercise of options and warrants, vesting of restricted stock units and convertible debt conversion (in shares) 2,511,873          
Issuance of preferred stock   $ 100 242,030     242,130
Issuance of preferred stock (in shares)   10,000,000        
Stock-based compensation expense     20,745     20,745
Cash dividends       (60,609)   (60,609)
Preferred dividends       (11,958)   (11,958)
Change in foreign currency translation adjustment and from current period hedged transactions         $ (1,397) (1,397)
Tax withholding on stock based compensation $ (1)   (4,272)     (4,273)
Tax withholding on stock based compensation (in shares) (111,456)          
Net income       587,121   587,121
Balance at Dec. 31, 2019 $ 1,134 $ 100 $ 2,777,601 $ 2,846,106 $ (1,397) $ 5,623,544
Balance (in shares) at Dec. 31, 2019 113,350,267 10,000,000