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Regulatory Matters (Details 2) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 GSWC | Dec. 31, 2012 GSWC | Dec. 31, 2011 GSWC | Apr. 30, 2012 GSWC WRAM, net of MCBA | Dec. 31, 2013 GSWC WRAM, net of MCBA | Dec. 31, 2012 GSWC WRAM, net of MCBA | Apr. 30, 2012 GSWC WRAM, net of MCBA Minimum | Apr. 30, 2012 GSWC WRAM, net of MCBA Maximum | Dec. 31, 2013 GSWC WRAM, net of MCBA Maximum | Dec. 31, 2013 GSWC WRAM | Dec. 31, 2013 GSWC Modified Cost Balancing Account | May 23, 2013 GSWC Base revenue requirement adjustment mechanism | Dec. 31, 2013 GSWC Base revenue requirement adjustment mechanism | Dec. 31, 2012 GSWC Base revenue requirement adjustment mechanism
Regulatory matters: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper, term |  |  |  |  |  |  |  | 90 days |  |  |  |  |  |  |  |  |
Amount billed to customers as surcharges |  |  |  |  |  |  |  | $ 26,500,000 |  |  |  |  |  |  |  |  |
Over collection | (214,000) | (11,709,000) | (18,748,000) | (214,000) | (11,709,000) | (18,748,000) |  | 468,000 |  |  |  |  |  |  |  |  |
Under (over) collection |  |  |  | 122,681,000 | 176,015,000 |  |  | (16,345,000) | 42,574,000 |  |  |  | 20,400,000 | 4,100,000 |  | 8,725,000 | 6,833,000
Alternative revenue program |  |  |  |  |  |  |  |  |  |  |  | 24 months |  |  |  |  |
Under-collection balances as a percentage of adopted annual revenues |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |
Recovery period for under-collection balances that are up to 15% of adopted annual revenues |  |  |  |  |  |  |  |  |  |  | 36 months |  |  |  |  |  |
Recovery period for under-collection balances greater than 15% of adopted annual revenues |  |  |  |  |  |  |  |  |  | 19 months |  | 18 months |  |  |  |  |
Annual surcharges as a percentage of the last authorized revenue requirement |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |
Period of surcharge approved |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |
Increase in revenue requirement recoverable through surcharges collected |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,300,000 | $ 1,800,000 |

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- Definition The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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