CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Other property and equipment, accumulated depreciation	$ 27,418	$ 27,424
Other assets, accumulated depreciation and amortization	$ 5,360	$ 4,376
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, shares issued (in shares)	5,610,020	5,530,232
Treasury stock, shares (in shares)	1,658	1,658