Annual report pursuant to Section 13 and 15(d)

Debt (Narrative) (Details)

v2.4.0.6
Debt (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended
May 31, 2011
Jan. 31, 2011
Dec. 31, 2010
years
Dec. 31, 2011
Debt Instrument [Line Items]        
Senior notes, at par     $ 175,000 $ 250,000
Unamortized discount on senior notes       2,814
Interest rate swap fair value       11,431
Wrote off unamortized debt issuance costs, pre-tax expense 8,488     8,488
Maximum borrowing capacity under previous revolving credit agreement   300,000    
New revolving credit agreement   350,000    
Revolving credit agreement maturity period, years   5    
Availability of revolving credit facility       350,000
Letters of credit outstanding amount       36,031
Interest rate of outstanding letters of credit       1.66%
Construction loan     95,000  
Maturity period of mortgage note payable, year     10  
Mortgage note non-recourse interest rate       5.14%
Net book value of collateralized properties       165,106
Fixed rate added to the LIBOR 3.50%      
Interest rate paid on swap agreements LIBOR plus 3.5%     LIBOR rate plus 3%
Interest rate paid on bank's certificate of deposit       bank's certificate of deposit rate plus 2%
Weighted average interest rate of outstanding borrowings       3.12%
Fair value of outstanding debt     336,766 351,578
7.25% Senior Notes [Member]
       
Debt Instrument [Line Items]        
Senior notes, at par 175,000      
Interest rate on notes, percentage 7.25%      
Senior notes due date Apr. 01, 2014      
Percentage of debt premium 103.625%      
5.75% Senior Notes [Member]
       
Debt Instrument [Line Items]        
Senior notes, at par 250,000      
Interest rate on notes, percentage 5.75%      
Senior notes, discount percentage 6.00%      
Senior notes due date Jun. 01, 2017      
Refinancing Of Debt [Member]
       
Debt Instrument [Line Items]        
Notes payable     80,000 77,847
Due August 31, 2014 [Member]
       
Debt Instrument [Line Items]        
Notes payable       9,100
Net book value of collateralized properties       $ 23,898
Fixed rate added to the LIBOR       3.00%
Fixed rate added to bank certificate rate       2.00%
Maximum [Member]
       
Debt Instrument [Line Items]        
Commitment fee percentage   0.50%    
Minimum [Member]
       
Debt Instrument [Line Items]        
Commitment fee percentage   0.25%