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Convertible Senior Debt (Details 1) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 05, 2015
Feb. 26, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Debt Conversion [Line Items]            
Loss on extinguishment     $ (3,190) $ (714) $ (38,344) $ (878)
Senior Notes due 2018 [Member]            
Debt Conversion [Line Items]            
Aggregate Principal   $ 120,087        
Cash payments to noteholders   13,641        
Loss on extinguishment   $ 13,372        
Senior Notes due 2018 [Member] | Common stock Class A            
Debt Conversion [Line Items]            
Class A Common Shares Issued   5,541,115        
Senior Notes due 2020 [Member]            
Debt Conversion [Line Items]            
Aggregate Principal   $ 128,238        
Cash payments to noteholders   19,283        
Loss on extinguishment   $ 19,038        
Senior Notes due 2020 [Member] | Common stock Class A            
Debt Conversion [Line Items]            
Class A Common Shares Issued   5,297,885        
Senior Notes due 2016 [Member]            
Debt Conversion [Line Items]            
Aggregate Principal $ 40,481          
Cash payments to noteholders 6,163          
Loss on extinguishment $ 2,732          
Senior Notes due 2016 [Member] | Common stock Class A            
Debt Conversion [Line Items]            
Class A Common Shares Issued 2,805,513          
Senior Notes due 2016, 2018 and 2020 [Member]            
Debt Conversion [Line Items]            
Aggregate Principal         288,806  
Cash payments to noteholders         39,087  
Loss on extinguishment         $ 35,142  
Senior Notes due 2016, 2018 and 2020 [Member] | Common stock Class A            
Debt Conversion [Line Items]            
Class A Common Shares Issued         13,644,513