Quarterly report pursuant to Section 13 or 15(d)

Leases - Schedule of Lease Assets (Details)

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Leases - Schedule of Lease Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Gross balance $ 317,015 $ 300,613
Accumulated depreciation (146,969) (124,036)
Property, plant, and equipment, net 170,046 176,577
Equipment Leased to Other Party    
Property, Plant and Equipment [Line Items]    
Gross balance 57,611 62,012
Accumulated depreciation (25,807) (25,232)
Property, plant, and equipment, net $ 31,804 $ 36,780