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Fair Value Measurements Schedule Of Fair Value Of Assets (Details) - Fair value, measurements, recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value Measurements [Line Items]    
Assets measured at fair value $ 68,449 $ 67,754
Money market funds [Member] | Cash and cash equivalents [Member]    
Fair Value Measurements [Line Items]    
Money market funds, included in cash and cash equivalents, fair value 50,001 50,001
Money market funds [Member] | Investments, employee benefit plans, at fair value [Member]    
Fair Value Measurements [Line Items]    
Mutual funds and money market funds, fair value [1] 1,173 1,348
Mutual funds [Member] | Investments, employee benefit plans, at fair value [Member]    
Fair Value Measurements [Line Items]    
Mutual funds and money market funds, fair value [1] 17,275 16,405
Fair Value, Inputs, Level 1 [Member]    
Fair Value Measurements [Line Items]    
Assets measured at fair value 17,275 16,405
Fair Value, Inputs, Level 1 [Member] | Money market funds [Member] | Cash and cash equivalents [Member]    
Fair Value Measurements [Line Items]    
Money market funds, included in cash and cash equivalents, fair value 0 0
Fair Value, Inputs, Level 1 [Member] | Money market funds [Member] | Investments, employee benefit plans, at fair value [Member]    
Fair Value Measurements [Line Items]    
Mutual funds and money market funds, fair value 0 0
Fair Value, Inputs, Level 1 [Member] | Mutual funds [Member] | Investments, employee benefit plans, at fair value [Member]    
Fair Value Measurements [Line Items]    
Mutual funds and money market funds, fair value [1] 17,275 16,405
Fair Value, Inputs, Level 2 [Member]    
Fair Value Measurements [Line Items]    
Assets measured at fair value 51,174 51,349
Fair Value, Inputs, Level 2 [Member] | Money market funds [Member] | Cash and cash equivalents [Member]    
Fair Value Measurements [Line Items]    
Money market funds, included in cash and cash equivalents, fair value 50,001 50,001
Fair Value, Inputs, Level 2 [Member] | Money market funds [Member] | Investments, employee benefit plans, at fair value [Member]    
Fair Value Measurements [Line Items]    
Mutual funds and money market funds, fair value [1] 1,173 1,348
Fair Value, Inputs, Level 2 [Member] | Mutual funds [Member] | Investments, employee benefit plans, at fair value [Member]    
Fair Value Measurements [Line Items]    
Mutual funds and money market funds, fair value 0 0
Fair Value, Inputs, Level 3 [Member]    
Fair Value Measurements [Line Items]    
Assets measured at fair value 0 0
Fair Value, Inputs, Level 3 [Member] | Money market funds [Member] | Cash and cash equivalents [Member]    
Fair Value Measurements [Line Items]    
Money market funds, included in cash and cash equivalents, fair value 0 0
Fair Value, Inputs, Level 3 [Member] | Money market funds [Member] | Investments, employee benefit plans, at fair value [Member]    
Fair Value Measurements [Line Items]    
Mutual funds and money market funds, fair value 0 0
Fair Value, Inputs, Level 3 [Member] | Mutual funds [Member] | Investments, employee benefit plans, at fair value [Member]    
Fair Value Measurements [Line Items]    
Mutual funds and money market funds, fair value $ 0 $ 0
[1] Included in Investments, employee benefit plans fair value on the consolidated balance sheets.