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Stockholders' Equity and Equity Compensation Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2023 | Aug. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2014
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |
Accrued excise tax | $ 900 |  | $ 900 |  | $ 900 |  |
Remaining number of shares available for repurchase | 100,000 | 100,000 | 100,000 |  | 100,000 |  |
Remaining authorized repurchase amount |  | $ 100,000 |  |  |  |  |
Repurchase of common stock for employee tax withholdings, shares |  |  | 3,000 | 7,000 | 171,000 | 132,000 |
Repurchase of common stock for tax withholdings, value |  |  | $ 100 | $ 400 | $ 9,600 | $ 8,400 |
Cash dividends declared per common share |  |  | $ 0.28 | $ 0.265 |  |  |
Cash dividend |  |  | $ 8,700 | $ 8,400 | $ 26,400 | 25,400 |
Stock warrants term |  |  |  |  |  |  | 10 years
Stock warrants, exercise price |  |  |  |  |  |  | $ 26.68
Performance based awards granted to executive management and certain key employees shares |  |  |  |  | 134,000 |  |
Vesting maturity date |  |  |  |  | first quarter of 2025 |  |
Vesting period |  |  |  |  | 2 years |  |
Stock-based compensation expense |  |  | $ 7,200 | $ 8,700 | $ 21,253 | $ 20,778 |
Market-based Awards |  |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |
Awards vested |  |  |  |  | 45,000 |  |
Restricted common stock |  |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |
Awards vested |  |  | 9,000 |  | 480,000 |  |
Restricted common stock | Minimum |  |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  |  | 2 years |  |
Restricted common stock | Maximum |  |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |
Comcast |  |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |
Issuance of stock warrants |  |  |  |  |  |  | 2,900,000
Stock warrants issued | 1,000,000 |  | 1,000,000 |  | 1,000,000 |  |
Stock warrants vested |  |  |  |  | 0 |  |
SEC Rule 10b5-1 Plan |  |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |
Repurchase of common stock, shares |  | 275,000 | 1,991,000 | 488,000 | 1,991,000 | 1,114,000 |
Total amount paid |  | $ 15,000 | $ 107,000 | $ 27,900 | $ 107,000 | $ 65,500 |
Weighted-average price per share |  | $ 54.65 | $ 53.73 | $ 57.27 | $ 53.73 | $ 58.8 |
2023 Convertible Notes |  |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |
Repurchase of common stock, shares | 1,680,000 |  |  |  |  |  |
Total amount paid | $ 90,100 |  |  |  |  |  |
Weighted-average price per share | $ 53.62 |  |  |  |  |  |
Second SEC Rule 10b5-1 Plan |  |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |
Repurchase of common stock, shares | 36,000 |  |  |  |  |  |
Total amount paid | $ 1,900 |  |  |  |  |  |
Weighted-average price per share | $ 52.13 |  |  |  |  |  |
Remaining authorized repurchase amount | $ 100,000 |  | $ 100,000 |  | $ 100,000 |  |
2005 Stock Incentive Plan |  |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |
Increase in number of common stock shares authorized and reserved for issuance |  | 2,900,000 |  |  |  |  |
Number of common stock shares authorized and reserved for issuance |  | 27,900,000 |  |  |  |  |

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