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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Class A [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Loss [Member]
Retained Earnings [Member]
Total
Cumulative Effect Adjustment [Member]
Common Stock [Member]
Class A [Member]
Cumulative Effect Adjustment [Member]
Additional Paid-in Capital [Member]
Cumulative Effect Adjustment [Member]
Treasury Stock [Member]
Cumulative Effect Adjustment [Member]
Accumulated Other Comprehensive Loss [Member]
Cumulative Effect Adjustment [Member]
Retained Earnings [Member]
Cumulative Effect Adjustment [Member]
Balance at beginning of period at Dec. 31, 2018 $ 91 $ 552,564 $ (1,326,605) $ (79,934) $ 1,635,751 $ 781,867            
Balance at beginning of period (ASC 842 [Member]) at Dec. 31, 2018             $ 0 $ 0 $ 0 $ 0 $ 657 $ 657
Stockholders' Equity [Roll Forward]                        
Net income 0 0 0 0 89,351 89,351            
Other comprehensive (loss) income, net of tax 0 0 0 (1,342) 0 (1,342)            
Repurchase of Class A common stock (Note 6) 0 0 (825) 0 0 (825)            
Exercise of employee stock options/vesting of stock awards 0 (4,904) 2,596 0 0 (2,308)            
Stock-based compensation 0 8,634 0 0 0 8,634            
Cash dividends 0 0 0 0 (41,084) (41,084)            
Balance at end of period at Jun. 30, 2019 91 556,294 (1,324,834) (81,276) 1,684,675 834,950            
Balance at beginning of period at Mar. 31, 2019 91 553,270 (1,325,251) (75,794) 1,658,879 811,195            
Stockholders' Equity [Roll Forward]                        
Net income 0 0 0 0 46,349 46,349            
Other comprehensive (loss) income, net of tax 0 0 0 (5,482) 0 (5,482)            
Repurchase of Class A common stock (Note 6) 0 0 0 0 0 0            
Exercise of employee stock options/vesting of stock awards 0 (569) 417 0 0 (152)            
Stock-based compensation 0 3,593 0 0 0 3,593            
Cash dividends 0 0 0 0 (20,553) (20,553)            
Balance at end of period at Jun. 30, 2019 91 556,294 (1,324,834) (81,276) 1,684,675 834,950            
Balance at beginning of period at Dec. 31, 2019 91 557,544 (1,324,826) (85,292) 1,727,772 875,289            
Stockholders' Equity [Roll Forward]                        
Net income 0 0 0 0 61,581 61,581            
Other comprehensive (loss) income, net of tax 0 0 0 (8,149) 0 (8,149)            
Repurchase of Class A common stock (Note 6) 0 0 (107,367) 0 0 (107,367)            
Exercise of employee stock options/vesting of stock awards 0 (2,753) 5,129 0 0 2,376            
Stock-based compensation 0 8,324 0 0 0 8,324            
Cash dividends 0 0 0 0 (40,042) (40,042)            
Balance at end of period at Jun. 30, 2020 91 563,115 (1,427,064) (93,441) 1,749,311 792,012            
Balance at beginning of period at Mar. 31, 2020 91 557,916 (1,384,036) (100,289) 1,726,816 800,498            
Stockholders' Equity [Roll Forward]                        
Net income 0 0 0 0 41,851 41,851            
Other comprehensive (loss) income, net of tax 0 0 0 6,848 0 6,848            
Repurchase of Class A common stock (Note 6) 0 0 (46,481) 0 0 (46,481)            
Exercise of employee stock options/vesting of stock awards 0 330 3,453 0 0 3,783            
Stock-based compensation 0 4,869 0 0 0 4,869            
Cash dividends 0 0 0 0 (19,356) (19,356)            
Balance at end of period at Jun. 30, 2020 $ 91 $ 563,115 $ (1,427,064) $ (93,441) $ 1,749,311 $ 792,012