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Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Sep. 30, 2018 |  | 112,009,000 |  |  |  |
Balance (in shares) at Sep. 30, 2018 |  |  |  |  |  | 3,015,000
Balance at Sep. 30, 2018 | $ 4,382,735 | $ 11,201 | $ 500,393 | $ 4,027,779 | $ 16,550 | $ (173,188)
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Net income (loss) | 18,959 |  |  | 18,959 |  |
Other comprehensive income | 225 |  |  |  | 225 |
Dividends declared | (78,488) |  |  | (78,488) |  |
Exercise of employee stock options, net of shares withheld for employee taxes (in shares) |  |  |  |  |  | (125,000)
Exercise of employee stock options, net of shares withheld for employee taxes | 224 |  | (6,756) |  |  | $ 6,980
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares) |  | 71,000 |  |  |  | (215,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes | (4,537) | $ 7 | (16,673) |  |  | $ 12,129
Stock-based compensation | 7,158 |  | 7,158 |  |  |
Balance (in shares) at Dec. 31, 2018 |  | 112,080,000 |  |  |  |
Balance (in shares) at Dec. 31, 2018 |  |  |  |  |  | 2,675,000
Balance at Dec. 31, 2018 | 4,326,238 | $ 11,208 | 484,122 | 3,997,283 | (12,296) | $ (154,079)
Balance (in shares) at Sep. 30, 2018 |  | 112,009,000 |  |  |  |
Balance (in shares) at Sep. 30, 2018 |  |  |  |  |  | 3,015,000
Balance at Sep. 30, 2018 | 4,382,735 | $ 11,201 | 500,393 | 4,027,779 | 16,550 | $ (173,188)
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Net income (loss) | 79,850 |  |  |  |  |
Other comprehensive income | 449 |  |  |  |  |
Balance (in shares) at Mar. 31, 2019 |  | 112,080,000 |  |  |  |
Balance (in shares) at Mar. 31, 2019 |  |  |  |  |  | 2,668,000
Balance at Mar. 31, 2019 | 4,318,620 | $ 11,208 | 493,421 | 3,979,708 | (12,072) | $ (153,645)
Balance (in shares) at Dec. 31, 2018 |  | 112,080,000 |  |  |  |
Balance (in shares) at Dec. 31, 2018 |  |  |  |  |  | 2,675,000
Balance at Dec. 31, 2018 | 4,326,238 | $ 11,208 | 484,122 | 3,997,283 | (12,296) | $ (154,079)
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Net income (loss) | 60,891 |  |  | 60,891 |  |
Other comprehensive income | 224 |  |  |  | 224 |
Dividends declared | (78,466) |  |  | (78,466) |  |
Exercise of employee stock options, net of shares withheld for employee taxes (in shares) |  |  |  |  |  | (7,000)
Exercise of employee stock options, net of shares withheld for employee taxes | 302 |  | (107) |  |  | $ 409
Vesting of restricted stock awards, net of shares withheld for employee taxes | 0 |  | (25) |  |  | $ 25
Stock-based compensation | 9,431 |  | 9,431 |  |  |
Balance (in shares) at Mar. 31, 2019 |  | 112,080,000 |  |  |  |
Balance (in shares) at Mar. 31, 2019 |  |  |  |  |  | 2,668,000
Balance at Mar. 31, 2019 | $ 4,318,620 | $ 11,208 | 493,421 | 3,979,708 | (12,072) | $ (153,645)
Balance (in shares) at Sep. 30, 2019 | 112,080,262 | 112,080,000 |  |  |  |
Balance (in shares) at Sep. 30, 2019 | 3,642,358 |  |  |  |  | 3,642,000
Balance at Sep. 30, 2019 | $ 4,012,223 | $ 11,208 | 510,305 | 3,714,307 | (28,635) | $ (194,962)
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Net income (loss) | 30,605 |  |  | 30,605 |  |
Other comprehensive income | 516 |  |  |  | 516 |
Dividends declared | (78,652) |  |  | (78,652) |  |
Exercise of employee stock options, net of shares withheld for employee taxes (in shares) |  |  |  |  |  | (110,000)
Exercise of employee stock options, net of shares withheld for employee taxes | 4,045 |  | (3,103) |  |  | $ 7,148
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares) |  | 71,000 |  |  |  | (258,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes | (3,401) | $ 7 | (18,126) |  |  | $ 14,718
Stock-based compensation | 10,201 |  | 10,201 |  |  |
Balance (in shares) at Dec. 31, 2019 |  | 112,151,000 |  |  |  |
Balance (in shares) at Dec. 31, 2019 |  |  |  |  |  | 3,274,000
Balance at Dec. 31, 2019 | $ 3,975,537 | $ 11,215 | 499,277 | 3,666,260 | (28,119) | $ (173,096)
Balance (in shares) at Sep. 30, 2019 | 112,080,262 | 112,080,000 |  |  |  |
Balance (in shares) at Sep. 30, 2019 | 3,642,358 |  |  |  |  | 3,642,000
Balance at Sep. 30, 2019 | $ 4,012,223 | $ 11,208 | 510,305 | 3,714,307 | (28,635) | $ (194,962)
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Net income (loss) | (389,935) |  |  |  |  |
Other comprehensive income | $ 1,032 |  |  |  |  |
Balance (in shares) at Mar. 31, 2020 | 112,151,563 | 112,151,000 |  |  |  |
Balance (in shares) at Mar. 31, 2020 | 4,733,267 |  |  |  |  | 4,733,000
Balance at Mar. 31, 2020 | $ 3,461,006 | $ 11,215 | 509,928 | 3,168,966 | (27,603) | $ (201,500)
Balance (in shares) at Dec. 31, 2019 |  | 112,151,000 |  |  |  |
Balance (in shares) at Dec. 31, 2019 |  |  |  |  |  | 3,274,000
Balance at Dec. 31, 2019 | 3,975,537 | $ 11,215 | 499,277 | 3,666,260 | (28,119) | $ (173,096)
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Net income (loss) | (420,540) |  |  | (420,540) |  |
Other comprehensive income | 516 |  |  |  | 516 |
Dividends declared | (76,754) |  |  | (76,754) |  |
Exercise of employee stock options, net of shares withheld for employee taxes | 0 |  | (47) |  |  | $ 47
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares) |  |  |  |  |  | (1,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes | 0 |  | (53) |  |  | $ 53
Stock-based compensation | 10,751 |  | 10,751 |  |  |
Share repurchases (in shares) |  |  |  |  |  | 1,460,000
Share repurchases | $ (28,504) |  |  |  |  | $ (28,504)
Balance (in shares) at Mar. 31, 2020 | 112,151,563 | 112,151,000 |  |  |  |
Balance (in shares) at Mar. 31, 2020 | 4,733,267 |  |  |  |  | 4,733,000
Balance at Mar. 31, 2020 | $ 3,461,006 | $ 11,215 | $ 509,928 | $ 3,168,966 | $ (27,603) | $ (201,500)

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