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Derivatives And Fair Value Measurements Derivatives And Fair Value Measurements (Available-for-sale securities) (Details) (USD $)
6 Months Ended
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]  
Held-to-maturity Securities, Sold Security, at Carrying Value $ 10,000,000
Held-to-maturity Securities, Transferred Security, at Carrying Value 10,000,000
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities, Gross Unrealized Gain 0
Available-for-sale Securities 9,987,000
Available-for-sale Securities, Gross Unrealized Loss 0
Available-for-sale Securities, Amortized Cost Basis 9,987,000
Debt Securities [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities, Gross Unrealized Gain 0
Available-for-sale Securities 9,987,000
Available-for-sale Securities, Gross Unrealized Loss 0
Available-for-sale Securities, Amortized Cost Basis $ 9,987,000