Share-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary of share-based compensation
Share based compensation	$ 846	$ 1,923
Incentive Stock Options [Member]
Summary of share-based compensation
Share based compensation	(4)	223
Non-Qualified Stock Options [Member]
Summary of share-based compensation
Share based compensation	69	164
Restricted stock [Member]
Summary of share-based compensation
Share based compensation	491	1,536
Restricted Stock Units (RSUs) [Member]
Summary of share-based compensation
Share based compensation	$ 290	$ 0