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Financial Instruments And Risk Management (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Derivative [Line Items]
Deferred net gains on derivatives accumulated in other comprehensive income expected reclassification to net income in next twelve months	$ 4,847
Maximum [Member]
Derivative [Line Items]
Derivatives remaining maturity	1 year
Aggregate unrealized gain of derivative contracts with single counterparty	$ 2,000

This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties.

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