Disclosures About Fair Value - Fair Value Measurements on a Non-Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Loss on intangible assets					$ (2,282)
Tangible water and other assets					0
Loss on tangible water and other assets					(3,509)
Loss on oil and gas wells	$ 0		$ (1,089)		(4,428)
Loss on real estate and development costs			(1,875)
Loss on real estate			(274)		(2,865)
Loss on investments in unconsolidated affiliates equity securities held at cost			(20,696)		(1,078)
Assets held-for-sale	125,052		125,052		152,554
Loss on assets held-for-sale			(15,298)
Selling costs	1,600
Impairment loss on classification of assets as held-for-sale, net of tax	(16,903)		(16,903)
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intangible water assets					3,638
Tangible water and other assets					0
Oil and gas wells	0		0		1,730
Real estate and development costs	1,326		1,326
Real estate	3,400		3,400		1,357
Investment in unconsolidated affiliates equity securities held at cost	293		293		$ 15,858
Assets held-for-sale	$ 125,052		$ 125,052