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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 | 86,500 | 86,500
Other comprehensive income, net of tax | 0 | 0 | 0 | (9,142) | 0 | (9,142)
Repurchase of Class A common stock (Note 6) | 0 | 0 | (35,823) | 0 | 0 | (35,823)
Exercise of employee stock options/vesting of stock awards | 0 | 58 | 5,893 | 0 | 0 | 5,951
Stock-based compensation | 0 | 13,267 | 0 | 0 | 0 | 13,267
Business Acquisitions (1.4 million shares) | 0 | 76,584 | 18,109 | 0 | 0 | 94,693
Equity component of convertible note settlement (net) | 0 | (23,262) | 19,887 | 0 | 0 | (3,375)
Cash dividends | 0 | 0 | 0 | 0 | (40,091) | (40,091)
Balance at end of period at Jun. 30, 2018 | 91 | 532,996 | (1,296,628) | (75,460) | 1,642,535 | 803,534
Balance at beginning of period at Mar. 31, 2018 | 91 | 523,233 | (1,280,586) | (55,474) | 1,611,864 | 799,128
Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 0 | 0 | 0 | 0 | 50,961 | 50,961
Other comprehensive income, net of tax | 0 | 0 | 0 | (19,986) | 0 | (19,986)
Repurchase of Class A common stock (Note 6) | 0 | 0 | (18,437) | 0 | 0 | (18,437)
Exercise of employee stock options/vesting of stock awards | 0 | 3,257 | 2,395 | 0 | 0 | 5,652
Stock-based compensation | 0 | 6,506 | 0 | 0 | 0 | 6,506
Cash dividends | 0 | 0 | 0 | 0 | (20,290) | (20,290)
Balance at end of period at Jun. 30, 2018 | 91 | 532,996 | (1,296,628) | (75,460) | 1,642,535 | 803,534
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 | 89,351 | 89,351
Other comprehensive 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 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

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