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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Millions | Total | Common Stock [Member] | Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | ---
Balance, shares at Dec. 31, 2017 |  | 19,310,049 |  |  |
Restricted stock awards, net of forfeitures, shares |  | 4,311 |  |  |
Common stock repurchased, shares | (6,185) | (6,185) |  |  |
Restricted stock units converted to common stock, shares |  | 1,439 |  |  |
Balance, shares at Sep. 30, 2018 |  | 19,309,614 |  |  |
Balance at Dec. 31, 2017 | $ 1,535.8 | $ 0.2 | $ 145.5 | $ 1,390.3 | $ (0.2)
Net income | 422.1 | 0.0 | 0.0 | 422.1 | 0.0
Other comprehensive income (loss) | (0.4) | 0.0 | 0.0 | 0.0 | (0.4)
Stock-based compensation | 7.8 | 0.0 | 7.8 | 0.0 | 0.0
Common stock repurchased, value | (2.0) | 0.0 | (0.9) | (1.1) | 0.0
Balance at Sep. 30, 2018 | 1,963.3 | $ 0.2 | 152.4 | 1,811.3 | (0.6)
Balance, shares at Jun. 30, 2018 |  | 19,309,645 |  |  |
Restricted stock awards, net of forfeitures, shares |  | (31) |  |  |
Balance, shares at Sep. 30, 2018 |  | 19,309,614 |  |  |
Balance at Jun. 30, 2018 | 1,809.6 | $ 0.2 | 149.7 | 1,660.3 | (0.6)
Net income | 151.0 | 0.0 | 0.0 | 151.0 | 0.0
Other comprehensive income (loss) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0
Stock-based compensation | 2.7 | 0.0 | 2.7 | 0.0 | 0.0
Balance at Sep. 30, 2018 | $ 1,963.3 | $ 0.2 | 152.4 | 1,811.3 | (0.6)
Balance, shares at Dec. 31, 2018 | 18,972,558 | 18,972,558 |  |  |
Restricted stock awards, net of forfeitures, shares |  | 4,981 |  |  |
Common stock repurchased, shares | (268,611) | (268,611) |  |  |
Restricted stock units converted to common stock, shares |  | 87,842 |  |  |
Balance, shares at Sep. 30, 2019 | 18,796,770 | 18,796,770 |  |  |
Balance at Dec. 31, 2018 | $ 1,990.9 | $ 0.2 | 154.9 | 1,836.1 | (0.3)
Net income | 494.2 | 0.0 | 0.0 | 494.2 | 0.0
Other comprehensive income (loss) | 1.2 | 0.0 | 0.0 | 0.0 | 1.2
Stock-based compensation | 5.7 | 0.0 | 5.7 | 0.0 | 0.0
Common stock repurchased, value | (109.2) | 0.0 | (4.9) | (104.3) | 0.0
Balance at Sep. 30, 2019 | $ 2,382.8 | $ 0.2 | 155.7 | 2,226.0 | 0.9
Balance, shares at Jun. 30, 2019 |  | 18,796,876 |  |  |
Restricted stock awards, net of forfeitures, shares |  | (106) |  |  |
Common stock repurchased, shares | 0 |  |  |  |
Balance, shares at Sep. 30, 2019 | 18,796,770 | 18,796,770 |  |  |
Balance at Jun. 30, 2019 | $ 2,215.3 | $ 0.2 | 153.7 | 2,060.6 | 0.8
Net income | 165.4 | 0.0 | 0.0 | 165.4 | 0.0
Other comprehensive income (loss) | 0.1 | 0.0 | 0.0 | 0.0 | 0.1
Stock-based compensation | 2.0 | 0.0 | 2.0 | 0.0 | 0.0
Balance at Sep. 30, 2019 | $ 2,382.8 | $ 0.2 | $ 155.7 | $ 2,226.0 | $ 0.9

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