Quarterly report pursuant to Section 13 or 15(d)

Equipment Acquisitions and Dispositions (Details)

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Equipment Acquisitions and Dispositions (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Property, Plant and Equipment [Line Items]    
Payments to acquire property, plant and equipment $ 5,649 $ 9,542
Gain (Loss) on Asset Dispositions and Impairments, Net    
Property, Plant and Equipment [Line Items]    
Amortization of deferred gains on sale of property $ 300