Consolidated Balance Sheet (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheet [Abstract]
Common Stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	48,076,860	47,764,505
Treasury stock, shares	16,582	16,582
Other property and equipment, net of accumulated depreciation	$ 24,263	$ 22,467
Other assets, net of accumulated depreciation and amortization	$ 5,911	$ 11,277