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Commitments and Contingencies, Rent (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Rent [Abstract]      
Total rent expense $ 12,605 $ 11,954 $ 10,171
Future minimum rental payments under operating leases [Abstract]      
2019 8,483    
2020 7,382    
2021 6,753    
2022 5,763    
2023 5,278    
Thereafter 10,590    
Total 44,249    
Real Estate [Member]      
Rent [Abstract]      
Total rent expense 9,272 8,983 7,550
Other [Member]      
Rent [Abstract]      
Total rent expense $ 3,333 $ 2,971 $ 2,621