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Significant Accounting Policies (Narrative) (Details) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]    
Company-owned life insurance contracts $ 30,200,000 $ 27,600,000
Senior Notes 252,143,000 262,857,000
Senior notes, fair value $ 263,100,000 $ 270,300,000