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Stockholders' Equity and Equity Compensation Plans (Details Textual) $ / shares in Units, $ in Thousands, CustomerAccount in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2016 CustomerAccount shares | Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares | Dec. 31, 2014 $ / shares shares
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |
Remaining number of shares available for repurchase |  | 6,800,000 |  | 6,800,000 |  |
Repurchase of common stock for employee tax withholdings, shares |  |  |  | 300,000 | 300,000 |
Repurchase of common stock for tax withholdings, value | $ |  |  |  | $ 13,000 | $ 8,000 |
Cash dividends declared per common share | $ / shares |  | $ 0.185 | $ 0.175 | $ 0.56 | $ 0.53 |
Cash dividend | $ |  | $ 6,000 | $ 5,700 | $ 18,000 | $ 17,200 |
Stock warrants term |  |  |  |  |  | 10 years
Stock warrants, exercise price | $ / shares |  |  |  |  |  | $ 26.68
Stock-based compensation expense | $ |  | $ 5,200 | $ 5,300 | $ 17,273 | $ 15,775 |
Performance Shares |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |
Performance based awards granted to executive management shares |  |  |  | 100,000 |  |
Vesting period |  |  |  | 3 years |  |
Restricted common stock |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |
Vesting period |  | 4 years |  | 4 years |  |
Migration Of Comcast Current Residential Customer Accounts |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |
Number of stock warrants vesting |  |  |  | 1,000,000 |  |
Migration Of Comcast Current Residential Customer Accounts | Subsequent Event |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |
Number of stock warrants vesting | 500,000 |  |  |  |  |
Number of customer account migrated | CustomerAccount | 5.8 |  |  |  |  |
Comcast Corporation |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |
Issuance of stock warrants |  |  |  |  |  | 2,900,000
Client contract incentive related to stock warrants | $ |  |  |  | $ 7,300 |  |
Amortization expense of client contract incentive related to stock warrants | $ |  |  |  | $ 3,100 |  |
Stock warrants exercised |  |  |  | 0 |  |
SEC Rule 10b5-1 Plan |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |
Repurchase of common stock, shares |  |  |  | 300,000 | 300,000 |
Total amount paid | $ |  |  |  | $ 9,500 | $ 7,000 |
Weighted-average price per share | $ / shares |  |  |  | $ 36.07 | $ 27.06 |

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- Definition Exercise price of the warrants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
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