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Subsequent Events (Details)
$ in Thousands
12 Months Ended
Feb. 04, 2016
Dec. 31, 2015
USD ($)
Jun. 23, 2015
Dec. 31, 2014
USD ($)
Jul. 31, 2012
Subsequent Event [Line Items]          
Restricted cash   $ 26,948   $ 16,447  
Stated interest rate (percent)     6.00%    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months   $ 46,793      
Senior Exchange Convertible Debt [Member] | Senior Credit Facility [Member]          
Subsequent Event [Line Items]          
Interest coverage ratio covenant (less than)   1.50      
Restricted cash   $ 25,600      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months   $ 46,800      
Senior Exchange Convertible Debt [Member] | Senior Credit Facility [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Interest coverage ratio (exceeded) 1.50        
Senior Exchange Convertible Debt [Member] | 7.50% Senior Exchange Convertible Notes [Member]          
Subsequent Event [Line Items]          
Stated interest rate (percent)         7.50%