Disclosures About Fair Value - Fair Value Measurements on a Non-Recurring Basis (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Loss on intangible assets		$ 269
Loss on oil and gas wells		1,816
Loss on real estate	$ 2,397	274
Loss on real estate		923
Loss on investments in unconsolidated affiliates equity securities held at cost		20,696
Fair Value, Measurements, Nonrecurring \| Fair Value, Inputs, Level 3
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intangible water assets		3,023
Oil and gas wells		2,542
Real estate and development costs	$ 5,645	3,400
Real estate and development costs		5,960
Investment in unconsolidated affiliates equity securities held at cost		$ 2,163

Equity Method and Cost Method Investments

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The amount of the gain (loss) recognized by the parent and included in its attributable portion of net income for the period due to deconsolidation of a subsidiary or derecognition of a group of assets. The gain (loss) recognized and included in the net income attributable to the parent for the period is generally computed as the difference between: (a) the aggregate of: (1) the fair value of any consideration received; (2) the fair value of any retained noncontrolling investment in the former subsidiary at the date the subsidiary was deconsolidated; and (3) the carrying amount of any noncontrolling interest in the former subsidiary (including any accumulated other comprehensive income attributable to the noncontrolling interest) at the date the subsidiary was deconsolidated and (b) the carrying amount of the former subsidiary's assets and liabilities.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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