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Share-Based Compensation - Compensation Cost Not Yet Recognized for Share-based Awards (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Total awards unvested shares 86,630
Total awards unvested shares | $ $ 1,490
AIR [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Total awards unvested shares 2,306,726
Employee Stock Option [Member] | AIR [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested shares 238,530
TSR Stock Awards [Member] | AIR [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested shares 589,323
Restricted Stock [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested shares 21,473
Unvested shares | $ $ 608
Restricted Stock [Member] | AIR [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested shares 73,190
TSR Restricted Stock Awards [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested shares 33,912
Unvested shares | $ $ 393
TSR Restricted Stock Awards [Member] | AIR [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested shares 188,936
TSR LTIP I Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested shares 22,911
Unvested shares | $ $ 439
TSR LTIP I Units [Member] | AIR [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested shares 112,739
TSR LTIP II Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested shares 8,334
Unvested shares | $ $ 50
TSR LTIP II Units [Member] | AIR [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested shares 1,104,008