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Stock-Based Compensation Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 stock_plan | Dec. 31, 2012 | Dec. 31, 2011
Stock compensation plans |  |  |
Number of stock incentive plans | 4 |  |
Stock-based compensation recognized in the income statement, before taxes | $ 2,009 | $ 1,931 | $ 1,520
Capitalized equity-based compensation cost | 334 | 259 | 247
Immediate vesting for employees of certain age and above | 55 years |  |
GSWC |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | 1,647 | 1,667 | 1,345
Capitalized equity-based compensation cost | 334 | 259 | 247
Nonqualified stock options | Employees and directors |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | 9 | 150 | 302
Nonqualified stock options | Employees and directors | GSWC |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | 8 | 147 | 307
Restricted Stock Units | Employees |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | 1,507 | 1,729 | 1,218
Restricted Stock Units | Employees | GSWC |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | 1,266 | 1,468 | 1,038
Performance awards |  |  |
Stock compensation plans |  |  |
Vesting period | 3 years |  |
Performance awards | Officer |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | (493) | (52) | 0
Performance awards | Officer | GSWC |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | $ (373) | $ (52) | $ 0
2000 and 2008 Employee Plans | Nonqualified stock options |  |  |
Stock compensation plans |  |  |
Expiration term | 10 years |  |
Vesting period | 3 years |  |
Percentage of rights vesting in the first two years from the date of grant | 33.00% |  |
Percentage of rights vesting in the third year from the date of grant | 34.00% |  |
2000 and 2008 Employee Plans | Restricted Stock Units |  |  |
Stock compensation plans |  |  |
Vesting period | 3 years |  |
Common stock entitled to be received under each award | 1 |  |
Percentage of rights vesting in the first two years from the date of grant | 33.00% |  |
Percentage of rights vesting in the third year from the date of grant | 34.00% |  |
2000 and 2008 Employee Plans | Performance awards |  |  |
Stock compensation plans |  |  |
Vesting period | 3 years |  |
Percentage of rights vesting in the first two years from the date of grant | 33.00% |  |
Percentage of rights vesting in the third year from the date of grant | 34.00% |  |
2003 Directors Plan | Nonqualified stock options |  |  |
Stock compensation plans |  |  |
Expiration term | 10 years |  |
Vesting period | 3 years |  |
2003 Directors Plan | Restricted Stock Units |  |  |
Stock compensation plans |  |  |
Annual retainer multiplier used in determining awards | 250.00% |  |
Vesting rights percentage | 33.30% |  |

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- Definition Represents the annual retainer multiplier used in determining awards. + References No definition available. + Details
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- Definition Period in which 33% vesting rights is earned by awardeed of the grant, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Represents the common stock entitled to be received under each share-based payment award. + References No definition available. + Details
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- Definition The period of time, from the grant date until the time at which the share-based [option] award expires. + References No definition available. + Details
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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, expressed as a percentage. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(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. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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