CONSOLIDATED STATEMENTS OF CAPITALIZATION - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Common Shareholders' Equity:
Common shares, no par value	$ 245,022	$ 253,199
Earnings reinvested in the business	220,923	253,602
Common shareholders' equity	465,945	506,801
Long-Term Debt
Total	325,853	326,090
Less: Current maturities	(312)	(292)
Long-Term Debt	325,541	325,798
Total capitalization	791,486	832,599
GSWC
Common Shareholders' Equity:
Common shares, no par value	238,795	235,607
Earnings reinvested in the business	184,935	199,583
Common shareholders' equity	423,730	435,190
Long-Term Debt
Total	325,853	326,090
Less: Current maturities	(312)	(292)
Long-Term Debt	325,541	325,798
Total capitalization	749,271	760,988
6.81% notes due 2028
Long-Term Debt
Total	15,000	15,000
6.81% notes due 2028 | GSWC
Long-Term Debt
Total	15,000	15,000
6.59% notes due 2029
Long-Term Debt
Total	40,000	40,000
6.59% notes due 2029 | GSWC
Long-Term Debt
Total	40,000	40,000
7.875% notes due 2030
Long-Term Debt
Total	20,000	20,000
7.875% notes due 2030 | GSWC
Long-Term Debt
Total	20,000	20,000
7.23% notes due 2031
Long-Term Debt
Total	50,000	50,000
7.23% notes due 2031 | GSWC
Long-Term Debt
Total	50,000	50,000
6.00% notes due 2041
Long-Term Debt
Total	62,000	62,000
6.00% notes due 2041 | GSWC
Long-Term Debt
Total	62,000	62,000
3.45% private placement notes due 2029
Long-Term Debt
Total	15,000	15,000
3.45% private placement notes due 2029 | GSWC
Long-Term Debt
Total	15,000	15,000
9.56% private placement notes due 2031
Long-Term Debt
Total	28,000	28,000
9.56% private placement notes due 2031 | GSWC
Long-Term Debt
Total	28,000	28,000
5.87% private placement notes due 2028
Long-Term Debt
Total	40,000	40,000
5.87% private placement notes due 2028 | GSWC
Long-Term Debt
Total	40,000	40,000
6.70% private placement notes due 2019
Long-Term Debt
Total	40,000	40,000
6.70% private placement notes due 2019 | GSWC
Long-Term Debt
Total	40,000	40,000
5.50% tax-exempt obligation due 2026
Long-Term Debt
Total	7,730	7,730
5.50% tax-exempt obligation due 2026 | GSWC
Long-Term Debt
Total	7,730	7,730
Tax-Exempt State Water Project due 2035
Long-Term Debt
Total	4,000	4,077
Tax-Exempt State Water Project due 2035 | GSWC
Long-Term Debt
Total	4,000	4,077
Variable Rate Obligation due 2018
Long-Term Debt
Total	89	125
Variable Rate Obligation due 2018 | GSWC
Long-Term Debt
Total	89	125
American Recovery and Reinvestment Act Obligation due 2033
Long-Term Debt
Total	4,034	4,158
American Recovery and Reinvestment Act Obligation due 2033 | GSWC
Long-Term Debt
Total	$ 4,034	$ 4,158