Fair Value Measurements (Fair Values Of The Company's Assets And Liabilities) (Details) - USD ($) |
Jun. 30, 2016 |
Dec. 31, 2015 |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||||||
Short-term marketable securities | $ 18,500,000 | $ 13,200,000 | |||||
Long-term marketable securities | 28,500,000 | 40,500,000 | |||||
Fair Value, Measurements, Recurring [Member] | |||||||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||||||
Cash equivalents | [1] | 3,800,000 | 6,400,000 | ||||
Short-term marketable securities | [2] | 18,500,000 | 13,200,000 | ||||
Long-term marketable securities | [2] | 28,500,000 | 40,500,000 | ||||
Total assets | 50,800,000 | 60,100,000 | |||||
Individual securities gross unrealized losses | 0 | 0 | |||||
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | |||||||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||||||
Cash equivalents | [1] | 400,000 | 6,400,000 | ||||
Short-term marketable securities | [2] | 3,900,000 | 9,500,000 | ||||
Long-term marketable securities | [2] | 20,300,000 | 30,600,000 | ||||
Total assets | 24,600,000 | 46,500,000 | |||||
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | |||||||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||||||
Cash equivalents | [1] | 3,400,000 | |||||
Short-term marketable securities | [2] | 14,600,000 | 3,700,000 | ||||
Long-term marketable securities | [2] | 8,200,000 | 9,900,000 | ||||
Total assets | $ 26,200,000 | $ 13,600,000 | |||||
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