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Fair Value Measurement (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Assets and liabilities measured at fair value    
Total $ 51,407 $ 55,860
Total investments at fair value 102,803 105,289
Level 1    
Assets and liabilities measured at fair value    
Total 51,407 55,860
Level 2    
Assets and liabilities measured at fair value    
Total 0 0
Level 3    
Assets and liabilities measured at fair value    
Total 0 0
Interest in registered investment companies    
Assets and liabilities measured at fair value    
Deferred compensation investments valued using net asset value as a practical expedient: 38,052 36,114
Fixed income fund    
Assets and liabilities measured at fair value    
Deferred compensation investments valued using net asset value as a practical expedient: 13,344 13,315
Deferred compensation investments    
Assets and liabilities measured at fair value    
Total 31,334 27,770
Deferred compensation investments | Level 1    
Assets and liabilities measured at fair value    
Total 31,334 27,770
Deferred compensation investments | Level 2    
Assets and liabilities measured at fair value    
Total 0 0
Deferred compensation investments | Level 3    
Assets and liabilities measured at fair value    
Total 0 0
Available for sale investment    
Assets and liabilities measured at fair value    
Total 20,073 28,090
Available for sale investment | Level 1    
Assets and liabilities measured at fair value    
Total 20,073 28,090
Available for sale investment | Level 2    
Assets and liabilities measured at fair value    
Total 0 0
Available for sale investment | Level 3    
Assets and liabilities measured at fair value    
Total $ 0 $ 0