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Rental Activity
12 Months Ended
Dec. 31, 2018
Leases [Abstract]  
Rental Activity Rental ActivityWe rent natural gas compressor packages to entities in the petroleum industry.  These rental arrangements are classified as operating leases and generally have original terms of six months to twenty-four months and continue on a month-to-month basis thereafter. Depreciation expense for rental equipment was $20.9 million, $20.0 million and $20.2 million for the years ended December 31, 2018, 2017 and 2016, respectively. Future minimum rent payments for arrangements not on a month-to-month basis at December 31, 2018 are as follows:
Years Ending December 31, 
(in thousands) 
20197,245 
20203,334 
20212,763 
20222,644 
20231,058 
Total 17,044