Share-Based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share-Based Compensation [Abstract]
Share-based compensation costs	$ 1,699	$ 1,537
Shares [Roll Forward]
Outstanding, beginning of period (in shares)	4,325
Granted (in shares)	15
Exercised (in shares)	(29)
Forfeited (in shares)	(33)
Expired (in shares)	(19)
Outstanding, end of period (in shares)	4,259
Exercisable, end of period (in shares)	2,447
Weighted-Average Exercise Price [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 15.09
Granted (in dollars per share)	$ 16.01
Exercised (in dollars per share)	$ 10.81
Forfeited (in dollars per share)	$ 11.57
Expired (in dollars per share)	$ 31.74
Outstanding, end of period (in dollars per share)	$ 15.07
Exercisable, end of period (in dollars per share)	$ 17.84
Weighted-Average Remaining Contractual Term (years) [Abstract]
Outstanding at March 31, 2014	6 years 2 months 19 days
Exercisable at March 31, 2014	4 years 9 months 14 days
Aggregate Intrinsic Value [Abstract]
Outstanding at March 31, 2014	19,083
Exercisable at March 31, 2014	$ 8,524
Weighted average grant-date fair value of options per share (in dollars per share)	$ 8.8
Restricted Stock and Restricted Stock Units (RSUs) [Member]
Shares [Roll Forward]
Nonvested, beginning of period (in shares)	841
Granted (in shares)	0
Vested (in shares)	(122)
Forfeited (in shares)	(14)
Nonvested, end of period (in shares)	705
Weighted-Average Grant Date Fair Value [Roll Forward]
Nonvested, beginning of period (in dollars per share)	$ 10.44
Granted (in dollars per share)	$ 0
Vested (in dollars per share)	$ 10.59
Forfeited (in dollars per share)	$ 10.64
Nonvested, end of period (in dollars per share)	$ 10.42