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
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Gross balance $ 314,835 $ 300,613
Accumulated depreciation (134,280) (124,036)
Property, plant, and equipment, net 180,555 176,577
Equipment Leased to Other Party    
Property, Plant and Equipment [Line Items]    
Gross balance 58,465,000 62,012,000
Accumulated depreciation (24,511,000) (25,232,000)
Property, plant, and equipment, net $ 33,954,000 $ 36,780,000