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Fair Value Measurements - Schedule Of Fair Value Of Assets (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Assets    
Assets measured at fair value $ 69,229 $ 67,850
Money Market Funds | Cash and cash equivalents    
Assets    
Money market funds, included in cash and cash equivalents, fair value 50,085 50,001
Money Market Funds | Investments, employee benefit plans, at fair value    
Assets    
Mutual funds and money market funds, fair value [1] 1,676 1,307
Mutual Funds | Investments, employee benefit plans, at fair value    
Assets    
Mutual funds and money market funds, fair value [1] 17,468 16,542
Fair Value, Level 1    
Assets    
Assets measured at fair value 17,468 16,542
Fair Value, Level 1 | Money Market Funds | Cash and cash equivalents    
Assets    
Money market funds, included in cash and cash equivalents, fair value 0 0
Fair Value, Level 1 | Money Market Funds | Investments, employee benefit plans, at fair value    
Assets    
Mutual funds and money market funds, fair value [1] 0 0
Fair Value, Level 1 | Mutual Funds | Investments, employee benefit plans, at fair value    
Assets    
Mutual funds and money market funds, fair value [1] 17,468 16,542
Fair Value, Level 2    
Assets    
Assets measured at fair value 51,761 51,308
Fair Value, Level 2 | Money Market Funds | Cash and cash equivalents    
Assets    
Money market funds, included in cash and cash equivalents, fair value 50,085 50,001
Fair Value, Level 2 | Money Market Funds | Investments, employee benefit plans, at fair value    
Assets    
Mutual funds and money market funds, fair value [1] 1,676 1,307
Fair Value, Level 2 | Mutual Funds | Investments, employee benefit plans, at fair value    
Assets    
Mutual funds and money market funds, fair value [1] 0 0
Fair Value, Level 3    
Assets    
Assets measured at fair value 0 0
Fair Value, Level 3 | Money Market Funds | Cash and cash equivalents    
Assets    
Money market funds, included in cash and cash equivalents, fair value 0 0
Fair Value, Level 3 | Money Market Funds | Investments, employee benefit plans, at fair value    
Assets    
Mutual funds and money market funds, fair value [1] 0 0
Fair Value, Level 3 | Mutual Funds | Investments, employee benefit plans, at fair value    
Assets    
Mutual funds and money market funds, fair value [1] $ 0 $ 0
[1] Included in Investments, employee benefit plans, at fair value on consolidated balance sheets.