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Rental Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property Subject to or Available for Operating Lease [Line Items]      
Depreciation $ 21,875 $ 21,147 $ 21,641
Operating Leases, Future Minimum Payments Receivable [Abstract]      
2019 7,245    
2020 3,334    
2021 2,763    
2022 2,644    
2023 1,058    
Total $ 17,044    
Minimum      
Property Subject to or Available for Operating Lease [Line Items]      
Rental arrangements, original term 6 months    
Maximum      
Property Subject to or Available for Operating Lease [Line Items]      
Rental arrangements, original term 24 months    
Rental Equipment      
Property Subject to or Available for Operating Lease [Line Items]      
Depreciation $ 20,900 $ 20,000 $ 20,200