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Consolidated Statements of Operations (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
General and administrative expenses, equity-based compensation	$ 3,624	$ 1,788	$ 1,452
Unrealized gains (losses) on derivative instruments	$ 323	$ (865)	$ 387

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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