Share-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Summary of share-based compensation
Share based compensation	$ 1,913	$ 1,771	$ 4,252	$ 5,609
Incentive Stock Options
Summary of share-based compensation
Share based compensation	86	211	175	646
Non-Qualified Stock Options
Summary of share-based compensation
Share based compensation	41	181	176	509
Restricted stock
Summary of share-based compensation
Share based compensation	1,182	1,379	2,754	4,454
Restricted stock units
Summary of share-based compensation
Share based compensation	$ 604	$ 0	$ 1,147	$ 0