FEDERAL AND STATE CURRENT AND DEFERRED INCOME TAX - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Net operating losses, capital losses, and tax credit carryforwards	$ 55,852	$ 67,838
Deferred compensation	1,212	10,908
Impairment loss on securities	36	1,221
Impairment loss on water assets	10,791	17,277
Impairment loss on real estate		1,847
Capitalized expenses		9,788
Employee benefits, including stock-based compensation	745	9,945
Excess tax basis in affiliate	5,743	7,676
Fixed assets	811	469
Other, net	1,011	3,528
Total deferred tax assets	76,201	130,497
Deferred tax liabilities:
Unrealized appreciation on securities	122	4,138
Revaluation of real estate and water assets	3,251	5,247
Excess book basis in affiliate		5,770
Other, net	520	2,113
Total deferred tax liabilities	3,893	17,268
Valuation allowance	(72,308)	(113,229)
Net deferred income tax asset	$ 0	$ 0