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Summary of significant accounting policies Long-term Debt Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Carrying amount of current portion of long term debt $ 2,603 $ 0
Senior secured notes due June 01, 2021 [Member]
   
Debt Instrument [Line Items]    
Interest rate (as a percent) 7.50%  
Senior secured notes due May 15, 2014 [Member]
   
Debt Instrument [Line Items]    
Interest rate (as a percent) 8.00%  
Senior unsecured notes due August 15, 2014 [Member]
   
Debt Instrument [Line Items]    
Interest rate (as a percent) 7.50%  
Long-term Debt [Member] | Senior secured notes due June 01, 2021 [Member]
   
Debt Instrument [Line Items]    
Carrying amount of secured long term debt 246,528 0
Fair value of long term debt 244,375 0
Interest rate (as a percent) 7.50% 0.00%
Long-term Debt [Member] | Senior secured notes due May 15, 2014 [Member]
   
Debt Instrument [Line Items]    
Carrying amount of secured long term debt 0 247,979
Fair value of long term debt 0 255,706
Interest rate (as a percent) 0.00% 8.00%
Long-term Debt [Member] | Senior unsecured notes due August 15, 2014 [Member]
   
Debt Instrument [Line Items]    
Carrying amount of unsecured long term debt 0 2,603
Fair value of long term debt   2,479
Interest rate (as a percent) 0.00% 7.50%
Short-term Debt [Member] | Senior unsecured notes due August 15, 2014 [Member]
   
Debt Instrument [Line Items]    
Carrying amount of current portion of long term debt 2,603 [1] 0 [1]
Fair value of current portion of long term debt $ 2,487  
Interest rate (as a percent) 7.50% 0.00%
[1] These items are recorded in Accrued and other current liabilities.