Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value Measurements [Abstract]

Fair value of derivative liabilities and marketable securities

The following table provides the Company’s derivative liabilities and marketable securities - restricted carried at fair value as measured on a recurring basis as of December 31, 2011 (dollars in thousands):

	Total Carrying Value at December 31, 2011			Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)			Significant unobservable inputs (Level 3)
Marketable securities - restricted	$	31,721		$	31,721	$	—		$	—
Derivative liabilities		(2,809	)		—		(2,809	)		—
	$	28,912		$	31,721	$	(2,809	)	$	—