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UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Cumulative Effect Period Of Adoption Adjustment [Member]
Class A and B Common Stock [Member]
Additional Paid-in Capital [Member]
Purchase Price Of Excess Of Predecessor Basis, Net Of Tax [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect Period Of Adoption Adjustment [Member]
Accumulated Other Comprehensive Income [Member]
Treasury Stock [Member]
Beginning Balance at Dec. 31, 2018 $ 980,834 $ (26) $ 419 $ 172,220 $ (15,458) $ 1,072,456 $ (26) $ (182) $ (248,621)
Beginning Balance (in shares) at Dec. 31, 2018     41,887,088           (7,431,083)
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201602Member         us-gaap:AccountingStandardsUpdate201602Member    
Purchase of treasury shares (24,998)               $ (24,998)
Purchase of treasury shares (in shares)                 (626,320)
Stock withheld for payments of withholding taxes (2,875)               $ (2,875)
Stock withheld for payments of withholding taxes (in shares)                 (75,881)
Issuance of restricted stock awards, net of forfeitures       (8,905)         $ 8,905
Issuance of restricted stock awards, net of forfeitures (in shares)                 283,820
Share-based compensation expense 12,434     12,434          
Net income 79,216         79,216      
Foreign currency translation adjustment (29)             (29)  
Ending Balance at Sep. 30, 2019 1,044,556   $ 419 175,749 (15,458) 1,151,646   (211) $ (267,589)
Ending Balance (in shares) at Sep. 30, 2019     41,887,088           (7,849,464)
Beginning Balance at Jun. 30, 2019 1,032,582   $ 419 170,619 (15,458) 1,125,541   (178) $ (248,361)
Beginning Balance (in shares) at Jun. 30, 2019     41,887,088           (7,369,052)
Purchase of treasury shares (17,716)               $ (17,716)
Purchase of treasury shares (in shares)                 (444,509)
Stock withheld for payments of withholding taxes (129)               $ (129)
Stock withheld for payments of withholding taxes (in shares)                 (3,168)
Issuance of restricted stock awards, net of forfeitures       1,383         $ (1,383)
Issuance of restricted stock awards, net of forfeitures (in shares)                 (32,735)
Share-based compensation expense 3,747     3,747          
Net income 26,105         26,105      
Foreign currency translation adjustment (33)             (33)  
Ending Balance at Sep. 30, 2019 1,044,556   $ 419 175,749 (15,458) 1,151,646   (211) $ (267,589)
Ending Balance (in shares) at Sep. 30, 2019     41,887,088           (7,849,464)
Beginning Balance at Dec. 31, 2019 1,075,279   $ 419 179,637 (15,458) 1,179,601   (186) $ (268,734)
Beginning Balance (in shares) at Dec. 31, 2019     41,887,088           (7,870,888)
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201602Member         us-gaap:AccountingStandardsUpdate201602Member    
Stock withheld for payments of withholding taxes (4,041)               $ (4,041)
Stock withheld for payments of withholding taxes (in shares)                 (77,491)
Issuance of restricted stock awards, net of forfeitures       (9,173)         $ 9,173
Issuance of restricted stock awards, net of forfeitures (in shares)                 218,248
Share-based compensation expense 12,676     12,676          
Net income 51,171         51,171      
Foreign currency translation adjustment (74)             (74)  
Ending Balance at Sep. 30, 2020 1,135,011   $ 419 183,140 (15,458) 1,230,772   (260) $ (263,602)
Ending Balance (in shares) at Sep. 30, 2020     41,887,088           (7,730,131)
Beginning Balance at Jun. 30, 2020 1,105,837   $ 419 178,914 (15,458) 1,205,991   (283) $ (263,746)
Beginning Balance (in shares) at Jun. 30, 2020     41,887,088           (7,706,638)
Stock withheld for payments of withholding taxes (97)               $ (97)
Stock withheld for payments of withholding taxes (in shares)                 (1,896)
Issuance of restricted stock awards, net of forfeitures       (241)         $ 241
Issuance of restricted stock awards, net of forfeitures (in shares)                 (21,597)
Share-based compensation expense 4,467     4,467          
Net income 24,781         24,781      
Foreign currency translation adjustment 23             23  
Ending Balance at Sep. 30, 2020 $ 1,135,011   $ 419 $ 183,140 $ (15,458) $ 1,230,772   $ (260) $ (263,602)
Ending Balance (in shares) at Sep. 30, 2020     41,887,088           (7,730,131)