CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
CONDENSED CONSOLIDATED BALANCE SHEETS
Vessels, accumulated depreciation (in dollars)	$ 352,360	$ 345,071
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	390,000,000	390,000,000
Common stock, issued shares	121,705,048	89,593,272
Common stock, outstanding shares	121,705,048	89,593,272