Share-Based Compensation (Summary of Stock Options Outstanding) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares vested and exercisable	734,761	714,200
Options vested and exercisable weighted average remaining contractual life	4 years 7 months 10 days	5 years 5 months 16 days
Options vested and exercisable weighted average exercise price	$ 6.30	$ 5.73
Options vested and exercisable intrinsic value	$ 7,886	$ 8,557
$3.21-$6.89
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range	$ 3.21
Range of exercise prices, upper range	$ 6.89
Number of shares vested and exercisable	459,684
Options vested and exercisable weighted average remaining contractual life	3 years 5 months 23 days
Options vested and exercisable weighted average exercise price	$ 5.10
Options vested and exercisable intrinsic value	5,492
$7.13-$8.17
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range	$ 7.13
Range of exercise prices, upper range	$ 8.17
Number of shares vested and exercisable	82,450
Options vested and exercisable weighted average remaining contractual life	6 years 9 months 22 days
Options vested and exercisable weighted average exercise price	$ 7.26
Options vested and exercisable intrinsic value	804
$8.65-$21.14
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range	$ 8.65
Range of exercise prices, upper range	$ 21.14
Number of shares vested and exercisable	192,627
Options vested and exercisable weighted average remaining contractual life	6 years 4 months 10 days
Options vested and exercisable weighted average exercise price	$ 8.76
Options vested and exercisable intrinsic value	1,590
$3.21-$4.31
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range		$ 3.21
Range of exercise prices, upper range		$ 4.31
Number of shares vested and exercisable		111,150
Options vested and exercisable weighted average remaining contractual life		2 years 3 months 7 days
Options vested and exercisable weighted average exercise price		$ 3.67
Options vested and exercisable intrinsic value		1,561
$4.53-$5.77
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range		$ 4.53
Range of exercise prices, upper range		$ 5.77
Number of shares vested and exercisable		314,775
Options vested and exercisable weighted average remaining contractual life		4 years 6 months 29 days
Options vested and exercisable weighted average exercise price		$ 4.79
Options vested and exercisable intrinsic value		4,067
$6.09-$8.70
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range		$ 6.09
Range of exercise prices, upper range		$ 8.70
Number of shares vested and exercisable		288,275
Options vested and exercisable weighted average remaining contractual life		7 years 7 months 28 days
Options vested and exercisable weighted average exercise price		$ 7.55
Options vested and exercisable intrinsic value		$ 2,929