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Rental Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property Subject to or Available for Operating Lease [Line Items]      
Depreciation $ 21,641 $ 22,605 $ 21,324
2017 6,207    
2018 500    
Total $ 6,707    
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 $ 20,200 $ 21,000 $ 19,800