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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Leases [Abstract]      
Rent expense $ 3,600 $ 3,700 $ 3,500
Liability related to rent escalations 1,100 $ 1,100  
Allowance for moving expenses and tenant improvements 1,500    
Future minimum non-cancelable operating lease payments      
2016 3,183    
2017 2,767    
2018 2,164    
2019 1,281    
2020 1,198    
Thereafter 2,389    
Total operating lease commitments $ 12,982    
Property subject to rent escalations | Minimum [Member]      
Operating Leased Assets [Line Items]      
Term of lease 48 months    
Property subject to rent escalations | Maximum [Member]      
Operating Leased Assets [Line Items]      
Term of lease 125 months    
Corporate headquarters      
Operating Leased Assets [Line Items]      
Term of lease 125 months