Non-Marketable Investments	9 Months Ended
Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]
Non-Marketable Investments	Note 3 — Non-Marketable Investments At September 30, 2013 and December 31, 2012, the carrying value of the Company’s non-marketable investments, which were composed primarily of interests in technology-related private equity funds, was $6.2 million and $6.6 million, respectively, and is included in other assets in the Consolidated Balance Sheets. One of the Company’s investments, with a book value of $0.9 million and $1.2 million at September 30, 2013 and December 31, 2012, respectively, is being accounted for using the cost method and, accordingly, is valued at cost unless an other-than-temporary impairment in its value occurs. The other investments are being accounted for using the equity method as the investments are limited partnerships and the Company has an ownership interest in excess of 5% and, accordingly, the Company records its share of the investee’s operating results each period. The Company recorded a gain (loss) from its non-marketable investments of $(0.1) million during the nine months ended September 30, 2013, and $0.8 million and $0.9 million during the three and nine months ended September 30, 2012, respectively, which is included in gains (losses) on investments, net in the Consolidated Statements of Income. Gains on investments were insignificant during the three months ended September 30, 2013. In May 2013, the Company extended the expiration date of a cash bonus plan, originally adopted in 2000, that would pay a bonus, after the return of invested capital from certain of the Company’s investments, to certain key employees. To date, no bonuses have been paid under the plan. The plan will now automatically expire on June 30, 2015, subject to earlier expiration as provided in the plan in the event that prior to such date there are less than 10 participants in the plan or all of the Company’s invested capital (as defined in the plan) has been returned to the Company.

Note 3 — Non-Marketable Investments

At September 30, 2013 and December 31, 2012, the carrying value of the Company’s non-marketable investments, which were composed primarily of interests in technology-related private equity funds, was $6.2 million and $6.6 million, respectively, and is included in other assets in the Consolidated Balance Sheets.

One of the Company’s investments, with a book value of $0.9 million and $1.2 million at September 30, 2013 and December 31, 2012, respectively, is being accounted for using the cost method and, accordingly, is valued at cost unless an other-than-temporary impairment in its value occurs. The other investments are being accounted for using the equity method as the investments are limited partnerships and the Company has an ownership interest in excess of 5% and, accordingly, the Company records its share of the investee’s operating results each period. The Company recorded a gain (loss) from its non-marketable investments of $(0.1) million during the nine months ended September 30, 2013, and $0.8 million and $0.9 million during the three and nine months ended September 30, 2012, respectively, which is included in gains (losses) on investments, net in the Consolidated Statements of Income. Gains on investments were insignificant during the three months ended September 30, 2013.

In May 2013, the Company extended the expiration date of a cash bonus plan, originally adopted in 2000, that would pay a bonus, after the return of invested capital from certain of the Company’s investments, to certain key employees. To date, no bonuses have been paid under the plan. The plan will now automatically expire on June 30, 2015, subject to earlier expiration as provided in the plan in the event that prior to such date there are less than 10 participants in the plan or all of the Company’s invested capital (as defined in the plan) has been returned to the Company.