Annual report pursuant to Section 13 and 15(d)

Long-Term Debt (Narrative) (Details)

v2.4.0.6
Long-Term Debt (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]    
Annual fee on revolving credit facility portion of credit agreement 0.50%  
Term loan    $ 69,841,000
Senior notes due 2016 240,000,000 240,000,000
Unamortized discount of Senior Notes 889,000 1,083,000
Purchase price percentage of principal offering assumption upon change of control 101.00%  
Secured Credit Agreement Expiring July 25, 2013 [Member]
    
Debt Instrument [Line Items]    
Maximum leverage ratio, required 2.75  
Minimum interest coverage ratio, required 3.00  
Actual leverage ratio 0.82  
Actual interest coverage ratio 10.38  
Other issuance expenses 7,300,000  
Terms of debt, years 5  
Secured Credit Agreement Expiring July 25, 2013 [Member] | Revolving Credit Facility [Member]
    
Debt Instrument [Line Items]    
Outstanding commercial and standby letters of credit issued under revolving credit facility 31,000,000  
Remaining borrowing capacity under revolving credit facility 119,000,000  
Revolving credit facility 150,000,000  
Secured Credit Agreement Expiring July 25, 2013 [Member] | Term Loan [Member]
    
Debt Instrument [Line Items]    
Prepayment of remaining term loan 69,800,000  
Term loan 150,000,000  
11.25% Senior Notes Due August 1, 2016; Interest Payable Each February 1 And August 1 Commencing February 1, 2009 [Member]
    
Debt Instrument [Line Items]    
Senior notes due 2016 240,000,000 240,000,000
Subordinated borrowing, interest rate 11.25%  
Unamortized discount of Senior Notes 1,600,000  
Other issuance expenses $ 7,300,000  
Terms of debt, years 8