Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis

The following table summarizes the fair value of the Company’s investment in California Water Service Group as required by ASC Topic 820 as of March 31, 2013 and December 31, 2012:

	Fair Value Measurements at March 31, 2013
			Quoted Prices in Active Markets for Identical Assets	Significant Observable Inputs	Significant Unobservable Inputs
	Total		(Level 1)	(Level 2)	(Level 3)
Assets:
Investment in California Water Service Group	$	7,664	7,664	—	—
	Fair Value Measurements at December 31, 2012
			Quoted Prices in Active Markets for Identical Assets	Significant Observable Inputs	Significant Unobservable Inputs
	Total		(Level 1)	(Level 2)	(Level 3)
Assets:
Investment in California Water Service Group	$	7,067	7,067	—	—