Annual report pursuant to Section 13 and 15(d)

Debt Issuance Costs (Details)

v2.4.0.6
Debt Issuance Costs (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]    
Debt issuance costs, net $ 33,356,000 $ 41,656,000
Scheduled amortization 29,600,000  
Deferred Finance Costs, Net [Abstract]    
Deferred Finance Costs, Gross 74,761,000  
Accumulated Amortization, Deferred Finance Costs (41,405,000)  
Deferred Finance Costs, Net 33,356,000  
Senior Notes [Member] | 2013 Senior Notes [Member]
    
Debt Instrument [Line Items]    
Amortization period 7 years  
Deferred Finance Costs, Net [Abstract]    
Deferred Finance Costs, Gross 9,353,000  
Accumulated Amortization, Deferred Finance Costs (6,837,000)  
Deferred Finance Costs, Net 2,516,000  
Senior Notes [Member] | 2016 Senior Notes [Member]
    
Debt Instrument [Line Items]    
Amortization period 10 years  
Deferred Finance Costs, Net [Abstract]    
Deferred Finance Costs, Gross 30,057,000  
Accumulated Amortization, Deferred Finance Costs (14,951,000)  
Deferred Finance Costs, Net 15,106,000  
Loans Payable [Member] | 2007 Term Loan
    
Debt Instrument [Line Items]    
Amortization period 5 years  
Deferred Finance Costs, Net [Abstract]    
Deferred Finance Costs, Gross 8,450,000  
Accumulated Amortization, Deferred Finance Costs (7,925,000)  
Deferred Finance Costs, Net 525,000  
Loans Payable [Member] | 2008 Loans [Member]
    
Debt Instrument [Line Items]    
Amortization period 10 years  
Deferred Finance Costs, Net [Abstract]    
Deferred Finance Costs, Gross 21,293,000  
Accumulated Amortization, Deferred Finance Costs (6,377,000)  
Deferred Finance Costs, Net 14,916,000  
Convertible Senior Unsecured Notes [Member]
    
Debt Instrument [Line Items]    
Amortization period 7 years  
Deferred Finance Costs, Net [Abstract]    
Deferred Finance Costs, Gross 5,608,000  
Accumulated Amortization, Deferred Finance Costs (5,315,000)  
Deferred Finance Costs, Net $ 293,000