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Summary Of Other Investments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Investments [Abstract]    
Short-term investments $ 20,252us-gaap_ShortTermInvestments $ 19,910us-gaap_ShortTermInvestments
Debt security, held-to-maturity 15,000us-gaap_HeldToMaturitySecurities 15,000us-gaap_HeldToMaturitySecurities
Equity investment 6,000us-gaap_AvailableForSaleSecuritiesEquitySecurities  
Total other investments $ 41,252us-gaap_OtherInvestments $ 34,910us-gaap_OtherInvestments