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Debt Obligations (Narrative) (Details) - USD ($)
shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2018
May 10, 2018
Dec. 31, 2017
Sep. 25, 2017
Mar. 31, 2017
Debt Instrument [Line Items]          
Long term obligations $ 520,713   $ 515,758    
Debt Issuance Costs, Line of Credit Arrangements, Net 700   700    
Convertible Debt 200,652   196,550    
Note conversion obligation fair value 0   (54,359)    
Convertible note hedge fair value $ 0   53,683    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 8,100        
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 $ 63,061   70,568    
Variable interest rate 3.60%        
Revolving credit facility [Member]          
Debt Instrument [Line Items]          
Long term obligations $ 257,000   245,000    
Accordion feature amount         $ 100,000
Line of Credit Facility, Maximum Borrowing Capacity $ 545,000        
Variable interest rate 3.60%        
Credit facility, revolving credit loan, remaining borrowing capacity $ 278,800        
Letters of credit outstanding 9,200        
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%        
Convertible note hedge shares       8,111  
Debt Instrument, Interest Rate, Effective Percentage 0.00%        
Warrants and Rights Outstanding $ 38,502        
Unamortized Debt Issuance Expense (6,255)   (6,685)    
Debt Instrument, Unamortized Discount $ (51,843)   (55,515)    
Fair Value, Measurements, Recurring [Member]          
Debt Instrument [Line Items]          
Note conversion obligation fair value     54,359    
Convertible note hedge fair value     53,683    
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]          
Debt Instrument [Line Items]          
Note conversion obligation fair value   $ 51,285 54,359    
Convertible note hedge fair value   $ 50,559 $ 53,683