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Derivative Instruments (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jul. 14, 2017
Apr. 20, 2017
Feb. 07, 2017
Dec. 31, 2016
Derivative [Line Items]                  
Pre-tax (charge) on derivative instruments $ (34,433) $ (8,473)   $ (100,213) $ (3,443)        
Net loss on financial instruments     $ (61) $ 276          
Gain/Loss convertible debt hedge asset and note obligation valuation $ 600                
May 9, 2016 [Member] | Swap [Member]                  
Derivative [Line Items]                  
Stated Interest Rate 1.703%     1.703%       0.00%  
Market Value (Liability)                 $ 0
Derivative Liability, Notional Amount $ 37,500     $ 37,500       $ 39,375 0
Interest Rate Derivative Assets, at Fair Value $ 2     $ 2          
March 31, 2022 [Member] | Swap [Member]                  
Derivative [Line Items]                  
Stated Interest Rate 1.90%     1.90%     0.00%    
Market Value (Liability) $ (126)     $ (126)         0
Derivative Liability, Notional Amount $ 50,000     $ 50,000     $ 50,000   0
March 31, 2022 Second [Member] | Swap [Member]                  
Derivative [Line Items]                  
Stated Interest Rate 0.00%     0.00%   0.00%      
Market Value (Liability) $ (225)     $ (225)         0
Derivative Liability, Notional Amount $ 75,000     $ 75,000   $ 75,000     0
June 30, 2017 [Member] [Member] | Swap [Member]                  
Derivative [Line Items]                  
Stated Interest Rate 1.1825%     1.1825%          
Market Value (Liability) $ 0     $ 0         (77)
Derivative Liability, Notional Amount $ 0     $ 0         43,125
May 5, 2021 [Member] [Member] [Member] | Swap [Member]                  
Derivative [Line Items]                  
Stated Interest Rate 0.00%     0.00%          
Derivative Liability, Notional Amount $ 37,500     $ 37,500         43,125
Interest Rate Derivative Assets, at Fair Value $ 544     $ 544         $ 547
Convertible Debt [Member]                  
Derivative [Line Items]                  
convertible note hedge shares       8.1