Stockholders' Equity (Tables) |
3 Months Ended | ||||||||||||||||||||||||||||
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Mar. 31, 2016 | |||||||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||||||||||||||
| Assumptions for the fair value of the right (option) to purchase shares under ESPP | The fair value of the option to purchase shares under the ESPP is estimated on the date of grant (January 1 of each year) associated with the four quarterly purchase dates using the following assumptions:
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| Schedule of Accumulated Other Comprehensive Income | Our components of Accumulated other comprehensive income are as follows:
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| Stock Options | |||||||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||||||||||||||
| Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The fair value of the option grants were estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:
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