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Subsequent event (Details) - USD ($)
shares in Thousands
 1 Months Ended 3 Months Ended
Apr. 04, 2016
Apr. 28, 2016
Mar. 27, 2016
Mar. 29, 2015
Dec. 31, 2015
Subsequent Event [Line Items]          
Conversion of convertible notes, shares issued upon conversion     3,000 2,300  
Amount outstanding     $ 1,063,171,000   $ 1,059,200,000
Mezzanine equity     12,877,000   $ 0
Convertible Notes Payable | Convertible Debt | Subsequent Event          
Subsequent Event [Line Items]          
Repurchased amount $ 44,300,000        
Convertible Notes Payable | Convertible Debt | Exchange Consideration          
Subsequent Event [Line Items]          
Mezzanine equity     $ 12,900,000    
Convertible Notes Payable | Convertible Debt | Exchange Consideration | Subsequent Event          
Subsequent Event [Line Items]          
Extinguishment of debt, amount 219,200,000        
Cash payment per $1,000 principal amount 1,000        
Repayments of debt 220,700,000        
Repayments of debt, accrued interest $ 1,500,000        
Conversion of convertible notes, shares issued upon conversion 2,170        
Amount outstanding $ 136,200,000        
Loss on extinguishment of debt   $ 16,300,000      
Convertible Notes Payable | Convertible Debt | Hedge Unwind Agreements and Warrant Unwind Agreements | Subsequent Event          
Subsequent Event [Line Items]          
Shares received from dealer counterparties 300