Share-Based Compensation (Summary of Stock Options Outstanding) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares vested and exercisable	724,501	731,442
Options vested and exercisable weighted average remaining contractual life	4 years 8 months 23 days	5 years 8 months 12 days
Options vested and exercisable weighted average exercise price	$ 6.22	$ 5.72
Options vested and exercisable intrinsic value	$ 11,687	$ 6,570
$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	472,028
Options vested and exercisable weighted average remaining contractual life	3 years 7 months 13 days
Options vested and exercisable weighted average exercise price	$ 5.04
Options vested and exercisable intrinsic value	8,171
$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	56,175
Options vested and exercisable weighted average remaining contractual life	6 years 11 months 1 day
Options vested and exercisable weighted average exercise price	$ 7.25
Options vested and exercisable intrinsic value	848
$8.65-$19.27
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	$ 19.27
Number of shares vested and exercisable	196,298
Options vested and exercisable weighted average remaining contractual life	6 years 9 months 15 days
Options vested and exercisable weighted average exercise price	$ 8.76
Options vested and exercisable intrinsic value	2,668
$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		116,100
Options vested and exercisable weighted average remaining contractual life		2 years 6 months 4 days
Options vested and exercisable weighted average exercise price		$ 3.65
Options vested and exercisable intrinsic value		1,282
$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		330,975
Options vested and exercisable weighted average remaining contractual life		4 years 10 months 10 days
Options vested and exercisable weighted average exercise price		$ 4.79
Options vested and exercisable intrinsic value		3,281
$6.09-$8.65
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		$ 8.65
Number of shares vested and exercisable		284,367
Options vested and exercisable weighted average remaining contractual life		7 years 11 months 16 days
Options vested and exercisable weighted average exercise price		$ 7.64
Options vested and exercisable intrinsic value		$ 2,007