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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | ---
Balance at Dec. 31, 2016 | $ 1,458,963 | $ 1,176 | $ 1,780,350 | $ (322,563)
Balance (in shares) at Dec. 31, 2016 |  | 117,554 |  |
Net income | 178,040 |  |  | 178,040
Retirement of common stock | (5,847) | $ (2) | (5,845) |
Retirement of common stock (in shares) |  | (176) |  |
Dividends declared on common stock | (199,764) |  |  | (199,764)
Restricted stock compensation, net of forfeitures | 13,286 |  | 13,286 |
Restricted stock grants |  | $ 5 | (5) |
Restricted stock grants (in shares) |  | 513 |  |
Stock options exercised | 6,930 | $ 3 | 6,927 |
Stock options exercised (in shares) |  | 313 |  |
Balance at Dec. 31, 2017 | 1,451,608 | $ 1,182 | 1,794,713 | (344,287)
Balance (in shares) at Dec. 31, 2017 |  | 118,204 |  |
Net income | 159,207 |  |  | 159,207
Retirement of common stock | (3,005) | $ (1) | (3,004) |
Retirement of common stock (in shares) |  | (139) |  |
Dividends declared on common stock | (205,675) |  |  | (205,675)
Restricted stock compensation, net of forfeitures | 13,132 |  | 13,132 |
Restricted stock grants |  | $ 5 | (5) |
Restricted stock grants (in shares) |  | 462 |  |
Stock options exercised | 2,367 | $ 1 | 2,366 |
Stock options exercised (in shares) |  | 147 |  |
Cumulative effect of adoption of new accounting standard | (2,575) |  |  | (2,575)
Balance at Dec. 31, 2018 | 1,415,059 | $ 1,187 | 1,807,202 | (393,330)
Balance (in shares) at Dec. 31, 2018 |  | 118,674 |  |
Net income | 188,886 |  |  | 188,886
Retirement of common stock | (3,531) | $ (2) | (3,529) |
Retirement of common stock (in shares) |  | (164) |  |
Dividends declared on common stock | (211,868) |  |  | (211,868)
Restricted stock compensation, net of forfeitures | 17,267 |  | 17,267 |
Restricted stock grants |  | $ 5 | (5) |
Restricted stock grants (in shares) |  | 524 |  |
Stock options exercised | 876 | $ 1 | 875 |
Stock options exercised (in shares) |  | 62 |  |
Cumulative effect of adoption of new accounting standard | (29,940) |  |  | (29,940)
Balance at Dec. 31, 2019 | $ 1,376,749 | $ 1,191 | $ 1,821,810 | $ (446,252)
Balance (in shares) at Dec. 31, 2019 |  | 119,096 |  |

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