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Subsequent events (Details)
3 Months Ended
Mar. 31, 2016
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2015
Subsequent Event [Line Items]      
Gains (Losses) on Extinguishment of Debt $ (150,000,000)    
2021 Revolving Credit Facility [Member]      
Subsequent Event [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 115,000,000    
2021 Revolving Credit Facility [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 50,000,000.0  
Minimum [Member] | 2021 Revolving Credit Facility [Member]      
Subsequent Event [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 7.00%    
Financial Covenant, Net Leverage 5    
Maximum [Member]      
Subsequent Event [Line Items]      
Financial Covenant, Net Leverage 7    
Maximum [Member] | 2021 Revolving Credit Facility [Member]      
Subsequent Event [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 10.00%   10.00%
Financial Covenant, Net Leverage 7