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Fair Value Measurements (Estimated Fair Value Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair Value Disclosures [Abstract]    
Long-term debt, Carrying Amount $ 373,541us-gaap_LongTermDebt $ 363,526us-gaap_LongTermDebt
Long-term debt, Fair Value $ 417,582us-gaap_LongTermDebtFairValue $ 388,581us-gaap_LongTermDebtFairValue