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Debt (Deerfield Notes) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 28, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]            
Interest paid in kind       $ (11,825) $ 3,908  
Loss on extinguishment of debt   $ 6,239 $ 0 6,239 0  
Secured notes [Member] | Secured Convertible Notes Due June 2018 [Member]            
Debt Instrument [Line Items]            
Repayments of notes payable $ 123,800          
Repayment of principal, including paid in kind interest 113,900          
Interest paid in kind 13,900 $ 2,083 $ 1,972 $ 4,151 $ 3,908  
Prepayment penalty amount 5,800          
Accrued interest paid 4,200          
Loss on extinguishment of debt $ 6,200          
Interest rate after extension option election (as a percent)   15.00%   15.00%    
Balance of unamortized closing fees and expenses           $ 400
Secured notes [Member] | Secured Convertible Notes Due June 2018 [Member] | Coupon Interest [Member]            
Debt Instrument [Line Items]            
Interest rate after extension option election (as a percent)   7.50%   7.50%    
Secured notes [Member] | Secured Convertible Notes Due June 2018 [Member] | Payment-in-kind interest [Member]            
Debt Instrument [Line Items]            
Interest rate after extension option election (as a percent)   7.50%   7.50%