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Long-Term Debt (Components Of Long-term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument    
Revolving credit facility $ 0 $ 0
7.25% senior unsecured notes 200,000 200,000
Long-term debt $ 200,000 $ 200,000