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Debt Obligations (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Sep. 25, 2017
Mar. 31, 2017
Debt Instrument [Line Items]        
Long term obligations $ 530,441 $ 515,758    
Debt Issuance Costs, Line of Credit Arrangements, Net 600 700    
Convertible Debt 198,584 196,550    
Note conversion obligation fair value (56,881) (54,359)    
Gain/loss on fair value of note conversion obligation 2,500      
Convertible note hedge fair value $ 56,046 53,683    
Unsubordinated term loan and Revolving credit facility [Member]        
Debt Instrument [Line Items]        
Collateral coverage percentage 125.00%      
Unsubordinated term loan [Member]        
Debt Instrument [Line Items]        
Long term obligations $ 66,857 70,568    
Variable interest rate 3.38%      
Revolving credit facility [Member]        
Debt Instrument [Line Items]        
Long term obligations $ 265,000 245,000    
Accordion feature amount       $ 100,000
Increased borrowing capacity       $ 120,000
Line of Credit Facility, Maximum Borrowing Capacity $ 545,000      
Variable interest rate 3.38%      
Credit facility, revolving credit loan, remaining borrowing capacity $ 270,700      
Letters of credit outstanding 9,300      
Aircraft loans [Member]        
Debt Instrument [Line Items]        
Long term obligations $ 0 3,640    
Maximum [Member] | Unsubordinated term loan and Revolving credit facility [Member]        
Debt Instrument [Line Items]        
Collateral coverage percentage 150.00%      
Maximum amount of common stock authorized for repurchase $ 100,000      
Minimum [Member] | Unsubordinated term loan and Revolving credit facility [Member]        
Debt Instrument [Line Items]        
Collateral coverage percentage 50.00%      
Convertible Debt [Member]        
Debt Instrument [Line Items]        
Convertible Debt $ 258,750 258,750 $ 258,750  
Debt Conversion, Converted Instrument, Rate 0.00%      
Debt Instrument, Interest Rate, Effective Percentage 0.00%      
Proceeds from Convertible Debt $ 252,281      
Warrants and Rights Outstanding 38,502      
Unamortized Debt Issuance Expense (6,479) (6,685)    
Debt Instrument, Unamortized Discount (53,687) (55,515)    
Fair Value, Measurements, Recurring [Member]        
Debt Instrument [Line Items]        
Note conversion obligation fair value 56,881 54,359    
Convertible note hedge fair value 56,046 53,683    
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]        
Debt Instrument [Line Items]        
Note conversion obligation fair value 56,881 54,359 $ (57,369)  
Convertible note hedge fair value $ 56,046 $ 53,683