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Fair Value Measurements (Summary Of Financial Assets And Liabilities Accounted For At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets:
Investments in marketable securities	$ 262,611	$ 264,443
Derivatives	18,476	19,954
Total assets	281,087
Level 1 [Member]
Assets:
Investments in marketable securities	13,964
Derivatives	12,653
Total assets	26,617
Level 2 [Member]
Assets:
Investments in marketable securities	248,647
Derivatives	(214)
Total assets	248,433
Level 3 [Member]
Assets:
Investments in marketable securities
Derivatives	6,037
Total assets	$ 6,037

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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