CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Allowance for doubtful accounts (in thousands of dollars)	$ 0	$ 0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common Stock, Shares, Issued	28,166,728	28,945,228
Common stock, shares outstanding	28,166,728	28,945,228
Preferred Class N [Member]
Preferred stock, par value (in dollars per share)	$ 10.00	$ 10.00
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	592	592
Preferred stock, shares outstanding	592	592
Preferred stock, liquidation preference (in thousands of dollars)	$ 592	$ 592