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Stockholders' Equity and Equity Compensation Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2014 | Apr. 30, 2020
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |  |
Remaining number of shares available for repurchase |  | 4,800,000 |  |  | 4,800,000 |  |  |
Repurchase of common stock for employee tax withholdings, shares |  | 2,000 |  | 4,000 | 159,000 | 107,000 |  |
Repurchase of common stock for tax withholdings, value |  | $ 100 |  | $ 400 | $ 7,700 | $ 4,500 |  |
Cash dividends declared per common share |  | $ 0.235 |  | $ 0.2225 |  |  |  |
Cash dividend |  | $ 7,800 |  | $ 7,400 | 15,500 | 14,700 |  |
Stock warrants term |  |  |  |  |  |  | 10 years |
Stock warrants, exercise price |  |  |  |  |  |  | $ 26.68 |
Stock-based compensation expense |  | $ 5,200 |  | $ 4,800 | $ 10,112 | $ 8,500 |  |
Performance Shares |  |  |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |  |
Performance based awards granted to executive management and certain key employees shares |  |  | 100,000 |  |  |  |  |
Vesting maturity date |  |  |  |  | first quarter of 2022 |  |  |
Vesting period |  |  | 2 years |  |  |  |  |
Restricted common stock |  |  |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 4 years |  |  |
Comcast |  |  |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |  |
Issuance of stock warrants |  |  |  |  |  |  | 2,900,000 |
Stock warrants issued |  | 1,000,000.0 |  |  | 1,000,000.0 |  |  |
Stock warrants vested |  |  |  |  | 0 |  |  |
Stock Incentive Plan 2005 |  |  |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |  |
Increase in number of shares approved for issuance under incentive plan | 3,600,000 |  |  |  |  |  |  |
Number of shares approved for issuance under incentive plan | 25,000,000.0 |  |  |  |  |  |  | 21,400,000
SEC Rule 10b5-1 Plan |  |  |  |  |  |  |  |
Stockholders Equity And Equity Compensation Plans [Line Items] |  |  |  |  |  |  |  |
Repurchase of common stock, shares |  | 9,000 |  | 144,000 | 151,000 | 393,000 |  |
Total amount paid |  | $ 400 |  | $ 6,500 | $ 6,800 | $ 15,800 |  |
Weighted-average price per share |  | $ 40.74 |  | $ 45.39 | $ 44.99 | $ 40.31 |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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