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Fair Value of Financial Instruments (Fair Value, by Balance Sheet Grouping) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities, at fair value $ 9,480 $ 41,654 $ 0
Derivative Asset 7,088 0  
Derivatives, at fair value 7,088 0  
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (1,785) (3,830)  
Derivatives, at fair value 1,785 3,830 98
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Fair Value at Issuance (445,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 20,362    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Fair Value Adustment (74,503)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 499,141    
Carrying (Reported) Amount, Fair Value Disclosure [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt Instrument, Fair Value Disclosure 1,170,866 389,722  
Estimate of Fair Value Measurement [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt Instrument, Fair Value Disclosure 1,174,164 395,660  
Convertible Obligation [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Fair Value at Issuance (445,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Fair Value Adustment (4,827)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 449,827    
Contingent Value Rights Obligation [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Fair Value at Issuance 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 20,362    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Fair Value Adustment (69,676)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 49,314    
Fair Value, Measurements, Recurring [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities, at fair value   37,824  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities, at fair value   0  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities, at fair value   3,830  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities, at fair value   41,654  
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities, at fair value 9,480    
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities, at fair value 0    
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities, at fair value 9,480    
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities, at fair value 0    
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivatives, at fair value 7,088    
Derivatives, at fair value 1,785 3,830 98
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivatives, at fair value 0    
Derivatives, at fair value 0 0 0
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivatives, at fair value 7,088    
Derivatives, at fair value 1,785 3,830 98
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivatives, at fair value 0    
Derivatives, at fair value 0 0 0
Preferred Stock and Senior Notes [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities, at fair value   41,654  
Preferred Stock and Senior Notes [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities, at fair value   0  
Preferred Stock and Senior Notes [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities, at fair value   0  
Preferred Stock and Senior Notes [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities, at fair value   41,654  
Convertible Debt [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt Instrument, Fair Value Disclosure 300,975 0  
Convertible Debt [Member] | Estimate of Fair Value Measurement [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt Instrument, Fair Value Disclosure 300,628 0  
Convertible Debt [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (449,827)    
Convertible Debt [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0    
Convertible Debt [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (449,827)    
Convertible Debt [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0    
Contingent Value Rights Obligation [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (49,314)    
Contingent Value Rights Obligation [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0    
Contingent Value Rights Obligation [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (49,314)    
Contingent Value Rights Obligation [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0    
Mortgages Notes Payable [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt Instrument, Fair Value Disclosure 269,891 265,118 35,320
Mortgages Notes Payable [Member] | Estimate of Fair Value Measurement [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt Instrument, Fair Value Disclosure 273,536 271,056 35,686
Senior Secured Credit Facility [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt Instrument, Fair Value Disclosure 0 124,604  
Senior Secured Credit Facility [Member] | Estimate of Fair Value Measurement [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt Instrument, Fair Value Disclosure 0 124,604  
Unsecured Debt [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt Instrument, Fair Value Disclosure 600,000 0 42,407
Unsecured Debt [Member] | Estimate of Fair Value Measurement [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt Instrument, Fair Value Disclosure $ 600,000 $ 0 $ 42,407