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Financial Instruments and Marketable Securities
 12 Months Ended
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
Financial Instruments and Marketable Securities
Note 2. Financial Instruments and Marketable Securities
Due to the varying short-term cash needs of our business, we periodically have marketable securities. We value these assets utilizing a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets and liabilities (Level 1) and the lowest priority to measurements involving significant unobservable inputs (Level 3). The three levels of the fair value hierarchy and how they are determined are defined earlier in Note 1.