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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 |  | 353 | 347 |  |  |  | $ 6 |  |  |  |  |
Shares awarded under stock compensation plan (shares) |  |  |  |  |  |  | 669 |  |  |  |  |
Purchase of treasury stock |  | (23,468) |  |  |  |  |  | $ (23,468) |  |  |  |
Purchases of treasury stock (shares) |  |  |  |  |  |  |  | (1,154) |  |  |  |
Change in fair value of interest rate swap and interest rate cap agreements, net of tax expense of $1,563 |  | 3,785 |  |  | 3,785 |  |  |  |  |  |  |
Restricted stock amortization |  | 6,011 | 6,011 |  |  |  |  |  |  |  |  |
Net income (loss) |  | 14,711 |  | 14,711 |  |  |  |  |  |  |  |
Dividends, Common Stock |  |  |  |  |  | $ 3,646 |  |  | $ 3,646 | $ 1,444 |  | $ 1,444
Ending balance at Jun. 30, 2018 |  | 786,980 | 739,212 | 638,895 | 5,092 |  | $ 641 | $ (596,981) |  |  | $ 121 |
Ending balance (shares) at Jun. 30, 2018 |  |  |  |  |  |  | 64,126 | 33,444 |  |  | 12,029 |
Beginning balance at Mar. 31, 2018 |  | 768,717 | 736,161 | 624,535 | 4,221 |  | $ 641 | $ (596,962) |  |  | $ 121 |
Beginning balance (shares) at Mar. 31, 2018 |  |  |  |  |  |  | 64,085 | 33,443 |  |  | 12,029 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Shares awarded under stock compensation plan |  | 2 | 2 |  |  |  | $ 0 |  |  |  |  |
Shares awarded under stock compensation plan (shares) |  |  |  |  |  |  | 41 |  |  |  |  |
Purchase of treasury stock |  | (19) |  |  |  |  |  | $ (19) |  |  |  |
Purchases of treasury stock (shares) |  |  |  |  |  |  |  | (1) |  |  |  |
Change in fair value of interest rate swap and interest rate cap agreements, net of tax expense of $1,563 |  | 871 |  |  | 871 |  |  |  |  |  |  |
Restricted stock amortization |  | 3,049 | 3,049 |  |  |  |  |  |  |  |  |
Net income (loss) |  | 16,905 |  | 16,905 |  |  |  |  |  |  |  |
Dividends, Common Stock |  |  |  |  |  | 1,537 |  |  | 1,537 | 1,008 |  | 1,008
Ending balance at Jun. 30, 2018 |  | 786,980 | 739,212 | 638,895 | 5,092 |  | $ 641 | $ (596,981) |  |  | $ 121 |
Ending balance (shares) at Jun. 30, 2018 |  |  |  |  |  |  | 64,126 | 33,444 |  |  | 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 |  | 59 | 54 |  |  |  | $ 5 |  |  |  |  |
Shares awarded under stock compensation plan (shares) |  |  |  |  |  |  | 531 |  |  |  |  |
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 |  | (3,273) |  |  | (3,273) |  |  |  |  |  |  |
Restricted stock amortization |  | 5,426 | 5,426 |  |  |  |  |  |  |  |  |
Net income (loss) |  | 68,821 |  | 68,821 |  |  |  |  |  |  |  |
Dividends, Common Stock |  |  |  |  |  | 6,209 |  |  | 6,209 | 2,406 |  | 2,406
Ending balance at Jun. 30, 2019 |  | 875,725 | 750,532 | 723,469 | 960 |  | $ 647 | $ (600,004) |  |  | $ 121 |
Ending balance (shares) at Jun. 30, 2019 |  |  |  |  |  |  | 64,728 | 33,629 |  |  | 12,029 |
Beginning balance at Mar. 31, 2019 |  | 852,286 | 747,920 | 701,182 | 2,372 |  | $ 647 | $ (599,956) |  |  | $ 121 |
Beginning balance (shares) at Mar. 31, 2019 |  |  |  |  |  |  | 64,677 | 33,625 |  |  | 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) |  |  |  |  |  |  | 51 |  |  |  |  |
Purchase of treasury stock |  | (48) |  |  |  |  |  | $ (48) |  |  |  |
Purchases of treasury stock (shares) |  |  |  |  |  |  |  | (4) |  |  |  |
Change in fair value of interest rate swap and interest rate cap agreements, net of tax expense of $1,563 |  | (1,412) |  |  | (1,412) |  |  |  |  |  |  |
Restricted stock amortization |  | 2,612 | 2,612 |  |  |  |  |  |  |  |  |
Net income (loss) |  | 26,599 |  | 26,599 |  |  |  |  |  |  |  |
Dividends, Common Stock |  |  |  |  |  | $ 3,109 |  |  | $ 3,109 | $ 1,203 |  | $ 1,203
Ending balance at Jun. 30, 2019 |  | 875,725 | $ 750,532 | 723,469 | $ 960 |  | $ 647 | $ (600,004) |  |  | $ 121 |
Ending balance (shares) at Jun. 30, 2019 |  |  |  |  |  |  | 64,728 | 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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