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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income
--- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2016 |  | 11,093,489 |  |  |
Beginning balance at Dec. 31, 2016 | $ 188,374 | $ 111 | $ 35,453 | $ 152,810 |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |
Stock-based compensation | 11,627 |  | 11,627 |  |
Issuance of restricted stock, net (in shares) |  | 73,936 |  |  |
Issuance of restricted stock, net | 0 | $ 1 | (1) |  |
Common stock dividends | (11,416) |  |  | (11,416) |
Net income (loss) | 20,612 |  |  | 20,612 |
Unrealized gains on marketable securities, net of tax | 0 |  |  |  |
Ending balance (in shares) at Dec. 31, 2017 |  | 11,167,425 |  |  |
Ending balance at Dec. 31, 2017 | 209,197 | $ 112 | 47,079 | 162,006 |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |
Stock-based compensation | 14,994 |  | 14,994 |  |
Issuance of restricted stock, net (in shares) |  | 155,874 |  |  |
Issuance of restricted stock, net | (776) | $ 1 | (777) |  |
Common stock dividends | (27,842) |  |  | (27,842) |
Net income (loss) | (15,671) |  |  | (15,671) |
Impact of adoption of new accounting standard | Accounting Standards Update 2014-09 | (171) |  |  | (171) |
Issuance of stock in connection with the acquisition of Capella Education Company (in shares) |  | 10,263,775 |  |  |
Issuance of stock in connection with the acquisition of Capella Education Company | 1,236,961 | $ 103 | 1,236,858 |  |
Filing fee related to new stock issuance | (148) |  | (148) |  |
Exercise of stock options, net (in shares) |  | 156,424 |  |  |
Exercise of stock options, net | 8,648 | $ 1 | 8,647 |  |
Unrealized gains on marketable securities, net of tax | 32 |  |  |  | $ 32
Ending balance (in shares) at Dec. 31, 2018 |  | 21,743,498 |  |  |
Ending balance at Dec. 31, 2018 | 1,425,224 | $ 217 | 1,306,653 | 118,322 | 32
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |
Stock-based compensation | 12,116 |  | 12,033 | 83 |
Issuance of restricted stock, net (in shares) |  | 117,947 |  |  |
Issuance of restricted stock, net | (7,472) | $ 1 | (7,473) |  |
Common stock dividends | (46,724) |  |  | (46,724) |
Net income (loss) | 81,138 |  |  | 81,138 |
Exercise of stock options, net (in shares) |  | 103,364 |  |  |
Exercise of stock options, net | (1,773) | $ 2 | (1,775) |  |
Unrealized gains on marketable securities, net of tax | 201 |  |  |  | 201
Ending balance (in shares) at Dec. 31, 2019 |  | 21,964,809 |  |  |
Ending balance at Dec. 31, 2019 | $ 1,462,710 | $ 220 | $ 1,309,438 | $ 152,819 | $ 233

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