Share-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Summary of share-based compensation
Share based compensation	$ 1,493	$ 1,915	$ 2,339	$ 3,838
Incentive Stock Options [Member]
Summary of share-based compensation
Share based compensation	93	212	89	435
Non-Qualified Stock Options [Member]
Summary of share-based compensation
Share based compensation	66	164	135	328
Restricted stock [Member]
Summary of share-based compensation
Share based compensation	1,081	1,539	1,572	3,075
Restricted Stock Units (RSUs) [Member]
Summary of share-based compensation
Share based compensation	$ 253	$ 0	$ 543	$ 0