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Fair Value Measurements (Balances Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available-for-sale securities, current portion $ 400 $ 400    
Assets        
Cash and cash equivalents 158,821 145,341 $ 177,838 $ 192,545
Restricted cash 19,030 18,107    
Investment available for sale 17,400 18,000    
Outstanding principal 3,322,475      
Fair Value, Measurements, Nonrecurring [Member]        
Assets        
Outstanding principal   3,481,568    
Fair Value, Measurements, Recurring        
Liabilities        
Contingent payments 3,632 3,792    
Assets        
Cash and cash equivalents 158,821 145,341    
Restricted cash 19,030 18,107    
Investment available for sale 17,839 18,357    
Merger earnout   75    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member]        
Liabilities        
Contingent payments 0 0    
Assets        
Cash and cash equivalents   145,341    
Cash and cash equivalents 158,821      
Restricted cash   18,107    
Investment available for sale 0 0    
Merger earnout   0    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member]        
Liabilities        
Contingent payments 0 0    
Assets        
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Investment available for sale 0 0    
Merger earnout   0    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member]        
Liabilities        
Contingent payments 3,632 3,792    
Assets        
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Investment available for sale 17,839 18,357    
Merger earnout   75    
Parent Company [Member]        
Assets        
Cash and cash equivalents 2 2 $ 0 $ 2,520
Outstanding principal 2,309,725 2,389,165    
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt instrument   3,534,365    
Estimate of Fair Value Measurement [Member] | Parent Company [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt instrument 2,348,120 2,416,873    
Holdco Note | Holdco Note | Parent Company [Member]        
Assets        
Outstanding principal   151,740    
Senior Notes | 9.00% senior notes due 2020 | Parent Company [Member]        
Assets        
Outstanding principal   350,000    
Senior Notes | 9.00% senior notes due 2020 | Parent Company [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Assets        
Outstanding principal $ 350,000      
Senior Notes | 9.00% senior notes due 2020 | Estimate of Fair Value Measurement [Member] | Parent Company [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt instrument   $ 359,625