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Detail of Certain Balance Sheet Accounts - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Capital expenditures incurred for purchase and construction of assets $ 23,400    
Accrued capital expenditures 5,094 $ 6,066 $ 9,200
Real Estate and Other Property and Equipment      
Property, Plant and Equipment [Line Items]      
Fixed assets acquired $ 14,100