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Long-Term Debt (Narrative) (Details) (USD $)
1 Months Ended3 Months Ended9 Months Ended9 Months Ended1 Months Ended1 Months Ended9 Months Ended9 Months Ended12 Months Ended1 Months Ended
Mar. 31, 2011
Sep. 30, 2011
Mar. 31, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Sep. 30, 2011
Maximum [Member]
Unrestricted Cash Reduction [Member]
Sep. 30, 2011
Minimum [Member]
Unrestricted Cash Reduction [Member]
Sep. 30, 2011
Unrestricted Cash Reduction [Member]
Sep. 30, 2011
Including Acquisition Bridge Debt [Member]
Sep. 30, 2011
Excluding Acquisition Bridge Debt [Member]
Apr. 30, 2011
AR Credit Facility [Member]
Sep. 30, 2011
AR Credit Facility [Member]
Mar. 31, 2011
AR Credit Facility [Member]
Apr. 30, 2011
6.875% Notes, Due 2011 [Member]
Sep. 30, 2011
6.875% Notes, Due 2011 [Member]
Dec. 31, 2010
6.875% Notes, Due 2011 [Member]
Sep. 30, 2010
6.875% Notes, Due 2011 [Member]
Sep. 30, 2011
6.6% Senior Notes, Due 2018 [Member]
Dec. 31, 2010
6.6% Senior Notes, Due 2018 [Member]
Sep. 30, 2010
6.6% Senior Notes, Due 2018 [Member]
Mar. 31, 2011
Term Loan Due 2012 [Member]
Mar. 31, 2011
Term Loan Facility [Member]
Mar. 31, 2011
Revolving Credit Facility [Member]
Credit facility commitment              $ 100,000,000        $ 250,000,000$ 350,000,000
Floating rate senior note repaid               242,140,000         
Outstanding borrowing under credit facility             100,000,000           
Long-term debt 1,045,485,000 1,031,129,0001,045,485,0001,031,129,0001,030,759,000          242,129,000242,118,000298,428,000298,288,000298,242,000   
Line of credit facility, interest rate description  one-month LIBOR plus 1.35% one-month LIBOR plus 1%                    
Additional borrowings under AR credit facility            100,000,000            
Annual principal payment of debt  5,000,000                      
Repayment of debt111,750,000                        
Debt instrument interest rate    the Federal Funds rate plus 0.5%                    
Debt instrument maturity periodMarch 31, 2015   April 20, 2012           2011  2018  2012  
Interest rate on notes               6.875%6.875%  6.60%     
Debt covenant         

The Credit Agreement and the AR Credit Facility, as amended, require the Corporation's ratio of consolidated debt to consolidated earnings before interest, taxes, depreciation, depletion and amortization (EBITDA), as defined, for the trailing twelve month period (the "Ratio") to not exceed 3.5x as of the end of any fiscal quarter, provided that the Corporation may exclude from the Ratio debt incurred in connection with certain acquisitions for a period of 180 days so long as the Corporation maintains specified ratings on its long-term unsecured debt and the Ratio calculated without such exclusion does not exceed 3.75x. Additionally, if no amounts are outstanding under both the Revolving Facility and the AR Credit Facility, consolidated debt, including debt guaranteed by the Corporation, may be reduced by the Corporation's unrestricted cash and cash equivalents in excess of $50,000,000, such reduction not to exceed $200,000,000, for purposes of the covenant calculation.

3.5x3.75x             
Reduction of consolidated debt in the debt ratio calculation       200,000,00050,000,000                
Additional interest expense 242,000 226,000715,000667,000                   
Increase in annual interest expense due to ongoing amortization of the terminated value of the swap agreements                    $ 1,000,000