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Consolidated Statements of Stockholders' Equity - 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
--- | --- | --- | --- | --- | --- | ---
Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative effect adjustment from adoption of ASC Topic | ASU 2016-09 [Member] | $ 0 | $ 2,800 | $ 0 | $ 0 | $ (2,800) | $ 0
Balance at beginning of period at Dec. 31, 2016 | 91 | 439,635 | (1,250,123) | (84,122) | 1,558,589 | 664,070
Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 0 | 0 | 0 | 0 | 129,437 | 129,437
Other comprehensive income, net of tax | 0 | 0 | 0 | 17,804 | 0 | 17,804
Repurchase of Class A common stock (Note 8) | 0 | 0 | (71,731) | 0 | 0 | (71,731)
Exercise of employee stock options/vesting of stock awards | 0 | 9,479 | 14,964 | 0 | 0 | 24,443
Stock-based compensation | 0 | 19,314 | 0 | 0 | 0 | 19,314
Acquisition of noncontrolling interests | 0 | (11,067) | 0 | 0 | 0 | (11,067)
Acquisitions | 0 | 6,188 | 2,196 | 0 | 0 | 8,384
Cash dividends | 0 | 0 | 0 | 0 | (76,058) | (76,058)
Balance at end of period at Dec. 31, 2017 | 91 | 466,349 | (1,304,694) | (66,318) | 1,609,168 | 704,596
Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative effect adjustment from adoption of ASC Topic | ASC 606 [Member] | 0 | 0 | 0 | 0 | (13,042) | (13,042)
Cumulative effect adjustment from adoption of ASC Topic | ASU 2018-02 [Member] | 0 | 0 | 0 | 0 | (1,681) | (1,681)
Net income | 0 | 0 | 0 | 0 | 121,887 | 121,887
Other comprehensive income, net of tax | 0 | 0 | 0 | (13,616) | 0 | (13,616)
Repurchase of Class A common stock (Note 8) | 0 | 0 | (69,565) | 0 | 0 | (69,565)
Exercise of employee stock options/vesting of stock awards | 0 | 2,804 | 7,973 | 0 | 0 | 10,777
Stock-based compensation | 0 | 26,609 | 0 | 0 | 0 | 26,609
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 | (80,581) | (80,581)
Balance at end of period at Dec. 31, 2018 | 91 | 552,564 | (1,326,605) | (79,934) | 1,635,751 | 781,867
Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative effect adjustment from adoption of ASC Topic | ASC Topic 842 [Member] | 0 | 0 | 0 | 0 | 657 | 657
Net income | 0 | 0 | 0 | 0 | 173,553 | 173,553
Other comprehensive income, net of tax | 0 | 0 | 0 | (5,358) | 0 | (5,358)
Repurchase of Class A common stock (Note 8) | 0 | 0 | (825) | 0 | 0 | (825)
Exercise of employee stock options/vesting of stock awards | 0 | (4,929) | 2,604 | 0 | 0 | (2,325)
Stock-based compensation | 0 | 9,909 | 0 | 0 | 0 | 9,909
Cash dividends | 0 | 0 | 0 | 0 | (82,189) | (82,189)
Balance at end of period at Dec. 31, 2019 | $ 91 | $ 557,544 | $ (1,324,826) | $ (85,292) | $ 1,727,772 | $ 875,289

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