Quarterly report pursuant to Section 13 or 15(d)

PROPERTY AND EQUIPMENT - Property and Equipment Acquisitions (Details)

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PROPERTY AND EQUIPMENT - Property and Equipment Acquisitions (Details)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Oct. 31, 2019
USD ($)
aircraft
Dec. 31, 2019
USD ($)
aircraft
Dec. 31, 2020
USD ($)
aircraft
Oct. 31, 2019
USD ($)
aircraft
Dec. 31, 2020
USD ($)
aircraft
Property, Plant and Equipment [Line Items]          
Number of aircraft delivered | aircraft 1 2 0 2 0
Capital expenditures $ 15,624 $ 32,142 $ 3,860 $ 41,574 $ 11,232
SAR aircraft          
Property, Plant and Equipment [Line Items]          
Number of aircraft delivered | aircraft 1 2 0 2 0
Aircraft and equipment          
Property, Plant and Equipment [Line Items]          
Capital expenditures $ 15,624 $ 32,109 $ 3,564 $ 38,386 $ 10,612
Land and buildings          
Property, Plant and Equipment [Line Items]          
Capital expenditures $ 0 $ 33 $ 296 $ 3,188 $ 620