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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Investments, Fair Value Disclosure $ 25,141 $ 26,156
Fair Value, Inputs, Level 1 [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Investments, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Investments, Fair Value Disclosure 25,141 26,156
Fair Value, Inputs, Level 3 [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Investments, Fair Value Disclosure 0 0
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Investments, Fair Value Disclosure 18,968 19,838
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Investments, Fair Value Disclosure 0 0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Investments, Fair Value Disclosure 18,968 19,838
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Investments, Fair Value Disclosure 0 0
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Investments, Fair Value Disclosure 6,173 6,318
Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Investments, Fair Value Disclosure 0 0
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Investments, Fair Value Disclosure 6,173 6,318
Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Investments, Fair Value Disclosure $ 0 $ 0