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Derivative Instruments (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 Purchase power contract quote | Jun. 30, 2013 GSWC MWs | Dec. 31, 2013 GSWC Purchase power contract | Dec. 31, 2012 GSWC Purchase power contract
Derivative instruments |  |  |  |
Number of megawatts of base load energy that the entity will be able to purchase under the new agreement |  | 12 |  |
Number of broker quotes received to determine fair value of derivative instrument | 1 |  |  |
Changes in the fair value of the derivative |  |  |  |
Balance, at beginning of the period |  |  | $ (3,060) | $ (7,611)
Unrealized gain on purchased power contracts |  |  | 3,060 | 4,551
Balance, at end of the period |  |  | $ 0 | $ (3,060)

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- Definition Represents the number of megawatts of base load energy that the entity will be able to purchase at a fixed price under the new agreement. + References No definition available. + Details
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- Definition Represents the number of broker quotes received in order to determine the fair value of the derivative instrument. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in earnings, arising from liabilities measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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