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Derivative Instruments (Details) - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 28, 2019
Sep. 25, 2017
Derivative [Line Items]          
Pre-tax (charge) on derivative instruments $ (12,302) $ 7,296 $ (79,789)    
Net (gain) loss on financial instruments $ 10,000 8 (1,400)    
gain/loss convertible debt hedge asset and note obligation valuation   (100) $ 600    
June 30, 2017 [Member] [Member] | Swap [Member]          
Derivative [Line Items]          
Stated Interest Rate 2.706%        
Market Value (Liability) $ (3,242) (1,138)      
Derivative Liability, Notional Amount $ 146,250 150,000      
May 5, 2021 [Member] [Member] [Member] | Swap [Member]          
Derivative [Line Items]          
Stated Interest Rate 1.09%        
Market Value (Liability) $ (111) (650)      
Derivative Liability, Notional Amount $ 20,625 28,125      
May 30, 2021 [Member] | Swap [Member]          
Derivative [Line Items]          
Stated Interest Rate 1.703%        
Market Value (Liability) $ 25 (366)      
Derivative Liability, Notional Amount $ 20,625 28,125      
March 31, 2022 One [Member] [Member] | Swap [Member]          
Derivative [Line Items]          
Stated Interest Rate 1.90%        
Market Value (Liability) $ 408 (829)      
Derivative Liability, Notional Amount $ 50,000 50,000      
March 31, 2022 Two [Member] [Member] [Member] | Swap [Member]          
Derivative [Line Items]          
Stated Interest Rate 1.95%        
Market Value (Liability) $ 696 (1,126)      
Derivative Liability, Notional Amount $ 75,000 75,000      
March 31, 2023 [Member] | Swap [Member]          
Derivative [Line Items]          
Stated Interest Rate 2.425%        
Market Value (Liability) $ 3,866 0      
Derivative Liability, Notional Amount $ 148,125 $ 0   $ 150,000  
Convertible Debt [Member]          
Derivative [Line Items]          
Convertible note hedge shares         8,100