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Derivatives And Risk Management Derivatives and Risk Management (Foreign Currency Exchange Contracts) (Details) CAD in Thousands, $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 CAD derivative_contracts | Jun. 30, 2017 USD ($) derivative_contracts | Dec. 31, 2016 CAD derivative_contracts | Dec. 31, 2016 USD ($) derivative_contracts
Foreign Currency Fair Value Hedge Derivative [Line Items] |  |  |  |
Number Of Days Canadian Currency Prices Are Settled With U.S. Dollars | 60 days |  |  |
Number of Foreign Currency Derivatives Held | derivative_contracts | 24 | 24 | 21 | 21
United States of America, Dollars | Foreign Exchange Contract [Member] |  |  |  |
Foreign Currency Fair Value Hedge Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | $ |  | $ 7,588 |  | $ 2,819
Canada, Dollars | Foreign Exchange Contract [Member] |  |  |  |
Foreign Currency Fair Value Hedge Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | CAD | CAD 10,075 |  | CAD 3,754 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Number of foreign currency exchange rate derivatives held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 + Details
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