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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Class A Common Stock | Class A Common Stock Common Stock | Class A Common Stock Treasury Stock | Class A Common Stock Retained Earnings | Class B Common Stock | Class B Common Stock Common Stock | Class B Common Stock Retained Earnings
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 |  | $ 786,760 | $ 732,854 | $ 625,356 | $ 1,307 |  | $ 635 | $ (573,513) |  |  | $ 121 |
Beginning balance (shares) at Dec. 31, 2017 |  |  |  |  |  |  | 63,457 | 32,290 |  |  | 12,029 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Shares awarded under stock compensation plan |  | 352 | 345 |  |  |  | $ 7 |  |  |  |  |
Shares awarded under stock compensation plan (shares) |  |  |  |  |  |  | 740 |  |  |  |  |
Purchase of treasury stock |  | (24,110) |  |  |  |  |  | $ (24,110) |  |  |  |
Purchases of treasury stock (shares) |  |  |  |  |  |  |  | (1,186) |  |  |  |
Change in fair value of interest rate swap and interest rate cap agreements, net of tax expense of $1,563 |  | 4,173 |  |  | 4,173 |  |  |  |  |  |  |
Restricted stock amortization |  |  | 10,589 |  |  |  |  |  |  |  |  |
Net income (loss) |  | 29,830 |  | 29,830 |  |  |  |  |  |  |  |
Dividends, Common Stock |  |  |  |  |  | $ 6,224 |  |  | $ 6,224 | $ 1,444 |  | $ 1,444
Ending balance at Sep. 30, 2018 |  | 803,844 | 743,788 | 651,436 | 5,480 |  | $ 642 | $ (597,623) |  |  | $ 121 |
Ending balance (shares) at Sep. 30, 2018 |  |  |  |  |  |  | 64,197 | 33,476 |  |  | 12,029 |
Beginning balance at Jun. 30, 2018 |  | 786,980 | 739,212 | 638,895 | 5,092 |  | $ 641 | $ (596,981) |  |  | $ 121 |
Beginning balance (shares) at Jun. 30, 2018 |  |  |  |  |  |  | 64,126 | 33,444 |  |  | 12,029 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Shares awarded under stock compensation plan |  | (1) | (2) |  |  |  | $ 1 |  |  |  |  |
Shares awarded under stock compensation plan (shares) |  |  |  |  |  |  | 71 |  |  |  |  |
Purchase of treasury stock |  | (642) |  |  |  |  |  | $ (642) |  |  |  |
Purchases of treasury stock (shares) |  |  |  |  |  |  |  | (32) |  |  |  |
Change in fair value of interest rate swap and interest rate cap agreements, net of tax expense of $1,563 |  | 388 |  |  | 388 |  |  |  |  |  |  |
Restricted stock amortization |  | 4,578 | 4,578 |  |  |  |  |  |  |  |  |
Net income (loss) |  | 15,118 |  | 15,118 |  |  |  |  |  |  |  |
Dividends, Common Stock |  |  |  |  |  | 1,987 |  |  | 1,987 | 590 |  | 590
Ending balance at Sep. 30, 2018 |  | 803,844 | 743,788 | 651,436 | 5,480 |  | $ 642 | $ (597,623) |  |  | $ 121 |
Ending balance (shares) at Sep. 30, 2018 |  |  |  |  |  |  | 64,197 | 33,476 |  |  | 12,029 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle | [1] | 3,918 |  | 3,918 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 |  | 823,116 | 745,052 | 670,691 | 4,233 |  | $ 642 | $ (597,623) |  |  | $ 121 |
Beginning balance (shares) at Dec. 31, 2018 |  |  |  |  |  |  | 64,197 | 33,476 |  |  | 12,029 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Shares awarded under stock compensation plan |  | 60 | 55 |  |  |  | $ 5 |  |  |  |  |
Shares awarded under stock compensation plan (shares) |  |  |  |  |  |  | 537 |  |  |  |  |
Purchase of treasury stock |  | (2,381) |  |  |  |  |  | $ (2,381) |  |  |  |
Purchases of treasury stock (shares) |  |  |  |  |  |  |  | (153) |  |  |  |
Change in fair value of interest rate swap and interest rate cap agreements, net of tax expense of $1,563 |  | (3,952) |  |  | (3,952) |  |  |  |  |  |  |
Restricted stock amortization |  |  | 8,107 |  |  |  |  |  |  |  |  |
Net income (loss) |  | 97,831 |  | 97,831 |  |  |  |  |  |  |  |
Dividends, Common Stock |  |  |  |  |  | 9,319 |  |  | 9,319 | 3,609 |  | 3,609
Ending balance at Sep. 30, 2019 |  | 902,425 | 753,214 | 748,166 | 281 |  | $ 647 | $ (600,004) |  |  | $ 121 |
Ending balance (shares) at Sep. 30, 2019 |  |  |  |  |  |  | 64,734 | 33,629 |  |  | 12,029 |
Beginning balance at Jun. 30, 2019 |  | 875,725 | 750,532 | 723,469 | 960 |  | $ 647 | $ (600,004) |  |  | $ 121 |
Beginning balance (shares) at Jun. 30, 2019 |  |  |  |  |  |  | 64,728 | 33,629 |  |  | 12,029 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Shares awarded under stock compensation plan |  | 0 | 0 |  |  |  | $ 0 |  |  |  |  |
Shares awarded under stock compensation plan (shares) |  |  |  |  |  |  | 6 |  |  |  |  |
Purchase of treasury stock |  | 0 |  |  |  |  |  | $ 0 |  |  |  |
Purchases of treasury stock (shares) |  |  |  |  |  |  |  | 0 |  |  |  |
Change in fair value of interest rate swap and interest rate cap agreements, net of tax expense of $1,563 |  | (679) |  |  | (679) |  |  |  |  |  |  |
Restricted stock amortization |  | 2,682 | 2,682 |  |  |  |  |  |  |  |  |
Net income (loss) |  | 29,010 |  | 29,010 |  |  |  |  |  |  |  |
Dividends, Common Stock |  |  |  |  |  | $ 3,110 |  |  | $ 3,110 | $ 1,203 |  | $ 1,203
Ending balance at Sep. 30, 2019 |  | 902,425 | $ 753,214 | 748,166 | $ 281 |  | $ 647 | $ (600,004) |  |  | $ 121 |
Ending balance (shares) at Sep. 30, 2019 |  |  |  |  |  |  | 64,734 | 33,629 |  |  | 12,029 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle | [1] | $ (7,428) |  | $ (7,428) |  |  |  |  |  |  |  |
[1] | See Note 1, “Summary of Significant Accounting Policies,” for further discussion.

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