Stock-Based Compensation (Details 5) (Performance Stock Units (PSUs) [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Performance Stock Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock units	0	329
Performance stock units, weighted-average grant date fair value	$ 0.00	$ 1.90
Performance stock units vested	(329)
Performance stock units vested, weighted-average grant date fair value	$ 1.90