CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Other property and equipment, accumulated depreciation	$ 21,748	$ 26,429
Other assets, accumulated depreciation and amortization	$ 5,768	$ 6,438
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	48,750,533	48,392,552
Treasury stock, shares	16,582	16,582