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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 Income (Loss) [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative effect adjustment from adoption of ASC Topic | ASC Topic 606 [Member] | $ 0 | $ 0 | $ 0 | $ 0 | $ (13,042) | $ (13,042)
Balance at beginning of period at Dec. 31, 2017 | 91 | 466,349 | (1,304,694) | (66,318) | 1,609,168 | 704,596
Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 0 | 0 | 0 | 0 | 139,646 | 139,646
Other comprehensive income, net of tax | 0 | 0 | 0 | (16,237) | 0 | (16,237)
Repurchase of Class A common stock (Note 6) | 0 | 0 | (48,222) | 0 | 0 | (48,222)
Exercise of employee stock options/vesting of stock awards | 0 | 1,772 | 7,223 | 0 | 0 | 8,995
Stock-based compensation | 0 | 20,311 | 0 | 0 | 0 | 20,311
Business Acquisitions | 0 | 80,064 | 19,794 | 0 | 0 | 99,858
Equity component of convertible note settlement (net) | 0 | (23,262) | 19,887 | 0 | 0 | (3,375)
Cash dividends | 0 | 0 | 0 | 0 | (60,396) | (60,396)
Balance at end of period at Sep. 30, 2018 | 91 | 545,234 | (1,306,012) | (82,555) | 1,675,376 | 832,134
Balance at beginning of period at Jun. 30, 2018 | 91 | 532,996 | (1,296,628) | (75,460) | 1,642,535 | 803,534
Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 0 | 0 | 0 | 0 | 53,146 | 53,146
Other comprehensive income, net of tax | 0 | 0 | 0 | (7,095) | 0 | (7,095)
Repurchase of Class A common stock (Note 6) | 0 | 0 | (12,399) | 0 | 0 | (12,399)
Exercise of employee stock options/vesting of stock awards | 0 | 1,714 | 1,330 | 0 | 0 | 3,044
Stock-based compensation | 0 | 7,044 | 0 | 0 | 0 | 7,044
Business Acquisitions | 0 | 3,480 | 1,685 | 0 | 0 | 5,165
Cash dividends | 0 | 0 | 0 | 0 | (20,305) | (20,305)
Balance at end of period at Sep. 30, 2018 | 91 | 545,234 | (1,306,012) | (82,555) | 1,675,376 | 832,134
Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative effect adjustment from adoption of ASC Topic | ASC Topic 842 [Member] | 0 | 0 | 0 | 0 | 657 | 657
Balance at beginning of period at Dec. 31, 2018 | 91 | 552,564 | (1,326,605) | (79,934) | 1,635,751 | 781,867
Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 0 | 0 | 0 | 0 | 133,441 | 133,441
Other comprehensive income, net of tax | 0 | 0 | 0 | (15,027) | 0 | (15,027)
Repurchase of Class A common stock (Note 6) | 0 | 0 | (825) | 0 | 0 | (825)
Exercise of employee stock options/vesting of stock awards | 0 | (4,930) | 2,604 | 0 | 0 | (2,326)
Stock-based compensation | 0 | 9,649 | 0 | 0 | 0 | 9,649
Cash dividends | 0 | 0 | 0 | 0 | (61,636) | (61,636)
Balance at end of period at Sep. 30, 2019 | 91 | 557,283 | (1,324,826) | (94,961) | 1,708,213 | 845,800
Balance at beginning of period at Jun. 30, 2019 | 91 | 556,294 | (1,324,834) | (81,276) | 1,684,675 | 834,950
Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 0 | 0 | 0 | 0 | 44,090 | 44,090
Other comprehensive income, net of tax | 0 | 0 | 0 | (13,685) | 0 | (13,685)
Repurchase of Class A common stock (Note 6) | 0 | 0 | 0 | 0 | 0 | 0
Exercise of employee stock options/vesting of stock awards | 0 | (26) | 8 | 0 | 0 | (18)
Stock-based compensation | 0 | 1,015 | 0 | 0 | 0 | 1,015
Cash dividends | 0 | 0 | 0 | 0 | (20,552) | (20,552)
Balance at end of period at Sep. 30, 2019 | $ 91 | $ 557,283 | $ (1,324,826) | $ (94,961) | $ 1,708,213 | $ 845,800

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