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Income Taxes - Significant Components of Deferred Taxes (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred Tax Assets:    
Real estate $ 50,759 $ 69,594
Employee benefits 13,185 15,752
Net operating loss carryforwards 2,804 13,827
Oil and gas properties 1,672 5,510
AMT credits 5,900 3,620
Income producing properties 2,055 0
Oil and gas percentage depletion carryforwards 3,478 3,616
Accruals not deductible until paid 552 911
Other assets 0 139
Gross deferred tax assets 80,405 112,969
Valuation allowance (73,405) (97,068)
Deferred tax asset net of valuation allowance 7,000 15,901
Deferred Tax Liabilities:    
Undeveloped land (1,359) (7,588)
Convertible debt (5,035) (6,516)
Income producing properties 0 (2,257)
Timber (283) (577)
Gross deferred tax liabilities 6,677 16,938
Deferred tax asset, net 323 0
Deferred tax liabilities, net $ 0 $ (1,037)