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Summary of Significant Accounting Policies (Tables)
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12 Months Ended |
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Dec. 31, 2011
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| Notes to Financial Statements [Abstract] |
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| Schedule of Cash and Cash Equivalents [Table Text Block] |
Cash and cash equivalents at December 31, 2011 and 2010 consisted of the following (in thousands): | | | | | | | | | | December 31, | | 2011 | | 2010 | Money market and demand accounts | $ | 338,211 |
| | $ | 181,465 |
| U.S. government agency instruments | — |
| | 21,992 |
| Commercial paper | 4,000 |
| | 11,994 |
| | $ | 342,211 |
| | $ | 215,451 |
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| Realized Gain (Loss) on Investments [Table Text Block] |
Realized gains and losses for 2011, 2010, and 2009 were as follows (in thousands): | | | | | | | | | | | | | | Year | | Gains | | Losses | | Net | 2011 | | $ | 37 |
| | $ | (274 | ) | | $ | (237 | ) | 2010 | | $ | 64 |
| | $ | (234 | ) | | $ | (170 | ) | 2009 | | $ | 181 |
| | $ | (104 | ) | | $ | 77 |
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| Available-for-sale Securities [Table Text Block] |
Short-term investments as of December 31, 2011 and 2010 consisted of the following (in thousands): | | | | | | | | | | December 31, | | 2011 | | 2010 | Commercial paper | $ | 156,574 |
| | $ | 163,400 |
| U.S. government agency instruments | 66,647 |
| | 140,076 |
| Corporate bonds and asset backed securities | 16,432 |
| | 22,742 |
| Mutual and exchange traded funds | 96,130 |
| | — |
| | $ | 335,783 |
| | $ | 326,218 |
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| Fair Value, Measurement Inputs, Disclosure [Table Text Block] |
Our financial assets that are accounted for at fair value on a recurring basis are presented in the tables below as of December 31, 2011 and December 31, 2010 (in thousands): | | | | | | | | | | | | | | | | | | Fair Value as of December 31, 2011 | | Level 1 | | Level 2 | | Level 3 | | Total | Assets: | | | | | | | | Money market and demand accounts (a) | $ | 338,211 |
| | $ | — |
| | $ | — |
| | $ | 338,211 |
| Mutual and exchange traded funds | 96,130 |
| | — |
| | — |
| | 96,130 |
| Commercial paper (b) | — |
| | 160,574 |
| | — |
| | 160,574 |
| U.S. government securities | — |
| | 66,647 |
| | — |
| | 66,647 |
| Corporate bonds and asset backed securities | — |
| | 16,432 |
| | — |
| | 16,432 |
| | $ | 434,341 |
| | $ | 243,653 |
| | $ | — |
| | $ | 677,994 |
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______________________________ | | (a) | Included within cash and cash equivalents. |
| | (b) | Includes $4.0 million of commercial paper that is included within cash and cash equivalents. |
| | | | | | | | | | | | | | | | | | Fair Value as of December 31, 2010 | | Level 1 | | Level 2 | | Level 3 | | Total | Assets: | | | | | | | | Money market and demand accounts (a) | $ | 181,465 |
| | $ | — |
| | $ | — |
| | $ | 181,465 |
| Commercial paper (b) | — |
| | 175,394 |
| | — |
| | 175,394 |
| U.S. government securities (b) | — |
| | 162,068 |
| | — |
| | 162,068 |
| Corporate bonds | — |
| | 22,742 |
| | — |
| | 22,742 |
| | $ | 181,465 |
| | $ | 360,204 |
| | $ | — |
| | $ | 541,669 |
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______________________________ | | (a) | Included within cash and cash equivalents. |
| | (b) | Includes $12.0 million and $22.0 million of commercial paper and U.S. government securities, respectively, that are included within cash and cash equivalents |
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| Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block] |
Patents consisted of the following (in thousands, except for useful life data): | | | | | | | | | | December 31, | | 2011 | | 2010 | Weighted average estimated useful life (years) | 10.7 |
| | 10.7 |
| Gross patents | $ | 245,999 |
| | $ | 218,722 |
| Accumulated amortization | (108,036 | ) | | (88,417 | ) | Patents, net | $ | 137,963 |
| | $ | 130,305 |
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| Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
The estimated aggregate amortization expense for the next five years related to our patents balance as of December 31, 2011 is as follows (in thousands): | | | | | 2012 | $ | 20,701 |
| 2013 | 20,086 |
| 2014 | 19,108 |
| 2015 | 17,756 |
| 2016 | 16,137 |
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| Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] |
Deferred charges are recorded in our Consolidated Balance Sheets within the following captions (in thousands): | | | | | | | | | | December 31, | | 2011 | | 2010 | Prepaid and other current assets | |
| | |
| Deferred commission expense | $ | 289 |
| | $ | 289 |
| Deferred contract origination costs | 79 |
| | 79 |
| Deferred financing costs | 1,303 |
| | — |
| Other non-current assets | |
| | |
| Deferred commission expense | 1,406 |
| | 1,623 |
| Deferred contract origination costs | 316 |
| | 395 |
| Deferred financing costs | 4,235 |
| | — |
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| Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
The following table reconciles the numerator and the denominator of the basic and diluted net income per share computation (in thousands, except for per share data): | | | | | | | | | | | | | | | | | | | | | | | | | | For the Year Ended December 31, | | 2011 | | 2010 | | 2009 | | Basic | | Diluted | | Basic | | Diluted | | Basic | | Diluted | Numerator: | | | | | | | | | | | | Net income applicable to common shareholders | $ | 89,468 |
| | $ | 89,468 |
| | $ | 153,616 |
| | $ | 153,616 |
| | $ | 87,256 |
| | $ | 87,256 |
| Denominator: | | |
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| Weighted-average shares outstanding: Basic | 45,411 |
| | 45,411 |
| | 44,084 |
| | 44,084 |
| | 43,295 |
| | 43,295 |
| Dilutive effect of stock options, RSUs, and convertible securities |
| | 603 |
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| | 740 |
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| | 1,032 |
| Weighted-average shares outstanding: Diluted |
| | 46,014 |
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| | 44,824 |
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| | 44,327 |
| Earnings Per Share: |
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| Net income: Basic | $ | 1.97 |
| | 1.97 |
| | $ | 3.48 |
| | 3.48 |
| | $ | 2.02 |
| | 2.02 |
| Dilutive effect of stock options, RSUs, and convertible securities | | | (0.03 | ) | | | | (0.05 | ) | | | | (0.05 | ) | Net income: Diluted | | | $ | 1.94 |
| | | | $ | 3.43 |
| | | | $ | 1.97 |
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