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Derivative Instruments (Details) - USD ($)
shares in Thousands, number in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
May 10, 2018
Dec. 31, 2017
Sep. 25, 2017
Derivative [Line Items]              
Pre-tax (charge) on derivative instruments $ 11,697 $ (67,649) $ 10,812 $ (65,780)      
Net (gain) loss on financial instruments     (3,152) $ 154      
Convertible note hedge fair value $ 0   0     $ 53,683  
gain/loss convertible debt hedge asset and note obligation valuation     $ (100)        
May 30, 2021 [Member] | Swap [Member]              
Derivative [Line Items]              
Stated Interest Rate 0.00%   0.00%        
Market Value (Liability) $ (570)   $ (570)     (240)  
Derivative Liability, Notional Amount $ 31,875   $ 31,875     35,625  
May 5, 2021 [Member] [Member] [Member] | Swap [Member]              
Derivative [Line Items]              
Stated Interest Rate 0.00%   0.00%        
Market Value (Liability) $ (943)   $ (943)     (719)  
Derivative Liability, Notional Amount $ 31,875   $ 31,875     35,625  
March 31, 2022 One [Member] [Member] | Swap [Member]              
Derivative [Line Items]              
Stated Interest Rate 0.00%   0.00%        
Market Value (Liability) $ (1,444)   $ (1,444)     (416)  
Derivative Liability, Notional Amount $ 50,000   $ 50,000     50,000  
March 31, 2022 Two [Member] [Member] [Member] | Swap [Member]              
Derivative [Line Items]              
Stated Interest Rate 0.00%   0.00%        
Market Value (Liability) $ (2,035)   $ (2,035)     (465)  
Derivative Liability, Notional Amount $ 75,000   $ 75,000     75,000  
Convertible Debt [Member]              
Derivative [Line Items]              
Convertible note hedge shares             8,111
Fair Value, Measurements, Recurring [Member]              
Derivative [Line Items]              
Convertible note hedge fair value           53,683  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]              
Derivative [Line Items]              
Convertible note hedge fair value         $ 50,559 $ 53,683