Stock-Based Compensation - Stock Option Activity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended				1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009	Nov. 30, 2013 Employee Stock Option [Member] Director [Member]	Nov. 30, 2012 Employee Stock Option [Member] Director [Member]	Aug. 31, 2011 Employee Stock Option [Member] Director [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Weighted average grant-date fair value of options granted					$ 11.29	$ 6.55	$ 6.00
Number of Shares
Beginning stock options outstanding (in shares)	2,283,842		2,128,906	1,308,998
Granted (in shares)	35,081	262,051	953,800
Exercised (in shares)	(155,731)	(56,658)	(32,124)
Forfeited (in shares)	(90,433)	(50,457)	(101,768)
Ending stock options outstanding (in shares)	2,072,759	2,283,842		1,308,998
Weighted Average Exercise Price Per Share
Beginning stock options outstanding (in dollars per share)	$ 9.23		$ 9.42	$ 12.30
Granted (in dollars per share)	$ 9.48	$ 6.56	$ 6.02
Exercised (in dollars per share)	$ 5.51	$ 5.27	$ 5.78
Forfeited (in dollars per share)	$ 9.73	$ 7.97	$ 15.68
Ending stock options outstanding (in dollars per share)	$ 9.49	$ 9.23		$ 12.30
Vested at December 31, 2013 and expected to vest
Number of Shares	2,045,835
Weighted Average Exercise Price Per Share (in dollars per share)	$ 10.89
Weighted Average Contractual Life	8 years 0 months 15 days
Aggregate Intrinsic Value	$ 947
Exercisable at December 31, 2013
Number of Shares	1,438,240
Weighted Average Exercise Price Per Share (in dollars per share)	$ 10.89
Weighted Average Contractual Life	6 years 6 months 7 days
Aggregate Intrinsic Value	$ 373