Quarterly report pursuant to Section 13 or 15(d)

Debt (Narrative) (Details)

v2.4.0.6
Debt (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 1 Months Ended
Sep. 30, 2012
Dec. 31, 2011
May 31, 2011
5.75% Senior Notes [Member]
Debt Instrument [Line Items]      
Senior notes, at par $ 250,000 $ 250,000 $ 250,000
Interest rate on notes, percentage     5.75%
Senior notes due date     Jun. 01, 2017
Senior notes, effective yield     6.00%
Unamortized discount on Senior notes 2,425 2,814  
Interest rate swap fair value 17,196 11,431  
Variable rate of swap, percentage 3.92%    
Revolving credit facility, maximum borrowing capacity 350,000    
Revolving credit facility, due date January 2016    
Revolving credit agreement 40,000 0  
Availability of revolving credit facility 310,000    
Letters of credit outstanding amount $ 35,631    
Letters of credit bore interest 1.03%