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FAIR VALUE DISCLOSURES (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
aircraft
Dec. 31, 2014
USD ($)
aircraft
Dec. 31, 2015
USD ($)
aircraft
Dec. 31, 2014
USD ($)
aircraft
Mar. 31, 2015
USD ($)
Jul. 13, 2015
USD ($)
Apr. 17, 2015
USD ($)
Fair Value [Line Items]              
Inventories $ 146,590   $ 146,590   $ 147,169    
Assets held for sale 52,916   52,916   57,827    
Goodwill 52,530   52,530   75,628    
Impairment of inventories 0 $ (3,805) (5,439) $ (7,167)      
Impairment charges on aircraft held for sale 0 (25,614) (22,031) (28,751)      
Goodwill impairment loss 0   (22,274)        
Gain (loss) on sale of assets and asset impairment charges $ 0 $ (29,419) $ (49,744) $ (35,918)      
Number of aircraft impaired | aircraft 0 12 11 18      
Other accrued liabilities $ 47,686   $ 47,686   48,667    
Other liabilities and deferred credits 33,151   33,151   39,782    
Contingent consideration- beginning balance     38,905        
Change in fair value of contingent consideration     1,197        
Payment of contingent consideration     (8,000) $ 0      
Contingent consideration- ending balance 32,102   32,102   38,905    
Carrying value of total debt 1,223,003   1,223,003   864,422    
Fair value of total debt 1,135,167   1,135,167   845,524    
Senior Notes | Senior Notes Due 2022              
Fair Value [Line Items]              
Carrying value of total debt 401,535   401,535   401,535    
Fair value of total debt 313,699   313,699   381,458    
Term Loan              
Fair Value [Line Items]              
Carrying value of total debt 339,138   339,138   222,179   $ 222,600
Fair value of total debt 339,138   339,138   222,179    
Revolving Credit Facility              
Fair Value [Line Items]              
Carrying value of total debt 232,050   232,050   83,800    
Fair value of total debt 232,050   232,050   83,800    
Term Loan Credit Facility              
Fair Value [Line Items]              
Carrying value of total debt 200,000   200,000   0    
Fair value of total debt 200,000   200,000   0    
Other debt              
Fair Value [Line Items]              
Carrying value of total debt 14,794   14,794   0    
Fair value of total debt 14,794   14,794   0    
Other debt | Airnorth              
Fair Value [Line Items]              
Carrying value of total debt 20,273   20,273   23,119    
Fair value of total debt 20,273   20,273   23,119    
Other debt | Eastern Airways              
Fair Value [Line Items]              
Carrying value of total debt 15,213   15,213   19,680    
Fair value of total debt 15,213   15,213   19,680    
Convertible Debt | Convertible Senior Notes Due 2038              
Fair Value [Line Items]              
Carrying value of total debt 0   0   114,109 $ 1,900  
Fair value of total debt 0   $ 0   $ 115,288    
Cougar              
Fair Value [Line Items]              
Fair value inputs, discount rate     4.00%   4.00%    
Airnorth              
Fair Value [Line Items]              
Fair value inputs, discount rate     2.00%   2.00%    
Fair Value, Measurements, Recurring              
Fair Value [Line Items]              
Rabbi Trust investments 2,326   $ 2,326   $ 2,379    
Total assets recurring 2,326   2,326   2,379    
Other accrued liabilities 29,021   29,021   33,938    
Other liabilities and deferred credits 3,081   3,081   4,967    
Total liabilities recurring 32,102   32,102   38,905    
Fair Value, Measurements, Recurring | Cougar              
Fair Value [Line Items]              
Total liabilities recurring 25,300   25,300   32,500    
Fair Value, Measurements, Recurring | Airnorth              
Fair Value [Line Items]              
Total liabilities recurring 6,800   6,800   6,400    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1              
Fair Value [Line Items]              
Rabbi Trust investments 2,326   2,326   2,379    
Total assets recurring 2,326   2,326   2,379    
Other accrued liabilities 0   0   0    
Other liabilities and deferred credits 0   0   0    
Total liabilities recurring 0   0   0    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2              
Fair Value [Line Items]              
Rabbi Trust investments 0   0   0    
Total assets recurring 0   0   0    
Other accrued liabilities 0   0   0    
Other liabilities and deferred credits 0   0   0    
Total liabilities recurring 0   0   0    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3              
Fair Value [Line Items]              
Rabbi Trust investments 0   0   0    
Total assets recurring 0   0   0    
Other accrued liabilities 29,021   29,021   33,938    
Other liabilities and deferred credits 3,081   3,081   4,967    
Total liabilities recurring 32,102   32,102   $ 38,905    
Fair Value, Measurements, Nonrecurring              
Fair Value [Line Items]              
Inventories 8,871 $ 4,588 8,871 4,588      
Assets held for sale 52,916 15,313 52,916 15,313      
Goodwill 52,530   52,530        
Total assets non-recurring 114,317 19,901 114,317 19,901      
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 1              
Fair Value [Line Items]              
Inventories 0 0 0 0      
Assets held for sale 0 0 0 0      
Goodwill 0   0        
Total assets non-recurring 0 0 0 0      
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 2              
Fair Value [Line Items]              
Inventories 8,871 4,588 8,871 4,588      
Assets held for sale 52,916 15,313 52,916 15,313      
Goodwill 0   0        
Total assets non-recurring 61,787 19,901 61,787 19,901      
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3              
Fair Value [Line Items]              
Inventories 0 0 0 0      
Assets held for sale 0 0 0 0      
Goodwill 52,530   52,530        
Total assets non-recurring $ 52,530 $ 0 $ 52,530 $ 0