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Derivative Financial Instruments (Schedule Of Fair Values Of Derivative Financial Instruments) (Details) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2017

Dec. 31, 2016

Derivatives, Fair Value [Line Items]

Asset Derivatives, Fair Value

$ 5,041

$ 14,818

Liability Derivatives, Fair Value

7,190

27,180

Margin deposit asset

28,900

50,600

Net unrealized gains (losses) on cash flow hedges

(6,800)

(17,000)

Derivative Financial Instruments [Member]

Derivatives, Fair Value [Line Items]

Asset Derivatives, Fair Value

^[2]

5,040

^[1]

14,818

^[3]

Other Assets [Member]

Derivatives, Fair Value [Line Items]

Asset Derivatives, Fair Value

1

Accrued and Other Liabilities [Member]

Derivatives, Fair Value [Line Items]

Liability Derivatives, Fair Value

7,131

27,099

Other Liabilities [Member]

Derivatives, Fair Value [Line Items]

Liability Derivatives, Fair Value

$ 59

$ 81

[1]	Balance at March 31, 2017 includes $6.8 million of net unrealized losses on derivative financial instruments designated as cash flow hedging instruments.
[2]	Derivative financial instruments as reflected on the consolidated balance sheets are net of related margin deposit assets of $28.9 million and $50.6 million at March 31, 2017 and December 31, 2016, respectively.
[3]	Balance at December 31, 2016 includes $17.0 million of net unrealized losses on derivative financial instruments designated as cash flow hedging instruments.

X

- Definition

Fair value, after offset of derivative liability, of 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of unrealized gain (loss) related to derivatives designated as cash flow hedging instruments, recorded in results of operations to the extent that the cash flow hedge is determined to be ineffective.

+ References

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