Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Narrative) (Details)

v2.3.0.15
Long-Term Debt (Narrative) (Details) (USD $)
 9 Months Ended 0 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Jul. 25, 2008
Secured Credit Agreement Expiring July 25, 2013 [Member]
Sep. 30, 2011
Secured Credit Agreement Expiring July 25, 2013 [Member]
Sep. 30, 2011
Secured Credit Agreement Expiring July 25, 2013 [Member]
Revolving Credit Facility [Member]
Jul. 25, 2008
Secured Credit Agreement Expiring July 25, 2013 [Member]
Revolving Credit Facility [Member]
Sep. 30, 2011
Secured Credit Agreement Expiring July 25, 2013 [Member]
Term Loan [Member]
Jul. 25, 2008
Secured Credit Agreement Expiring July 25, 2013 [Member]
Term Loan [Member]
Jul. 28, 2008
11.25% Senior Notes Due August 1, 2016; Interest Payable Each February 1st And August 1st [Member]
Sep. 30, 2011
11.25% Senior Notes Due August 1, 2016; Interest Payable Each February 1st And August 1st [Member]
Dec. 31, 2010
11.25% Senior Notes Due August 1, 2016; Interest Payable Each February 1st And August 1st [Member]
Sep. 30, 2010
11.25% Senior Notes Due August 1, 2016; Interest Payable Each February 1st And August 1st [Member]
Debt Instrument [Line Items]                          
Term loan                 $ 150,000,000        
Revolving credit facility             150,000,000            
Percentage above LIBOR interest rate               2.00%          
Interest rate at end of period               2.24%          
Maximum leverage ratio, required         2.75                
Minimum interest coverage ratio, required         3.00                
Actual leverage ratio         1.08                
Actual interest coverage ratio         9.86                
Outstanding commercial and standby letters of credit issued under revolving credit facility           35,100,000              
Remaining borrowing capacity under revolving credit facility           114,900,000              
Annual fee on revolving credit facility portion of credit agreement 0.50%                        
Senior notes due 2016 240,000,000 240,000,000 240,000,000             240,000,000 240,000,000 240,000,000 240,000,000
Subordinated borrowing, interest rate                   11.25% 11.25%    
Unamortized discount of Senior Notes 938,000 1,083,000 1,131,000             1,600,000      
Other issuance expenses         $ 7,300,000         $ 7,300,000      
Maturity description       five-year maturity           eight-year term of the Senior Notes