Summary Of Significant Accounting Policies (Schedule Of Fair Values Of The Net Assets (Liabilities)) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Derivative Counterparty [Line Items]
Total assets	$ 31,100
Bank of Montreal
Derivative Counterparty [Line Items]
Total assets	27,800
Scotiabank
Derivative Counterparty [Line Items]
Total assets	$ 3,300

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant