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Share-Based Compensation (Summary of Stock Options Outstanding) (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares vested and exercisable	455,887	734,761
Options vested and exercisable weighted average remaining contractual life	5 years 2 months 5 days	4 years 7 months 10 days
Options vested and exercisable weighted average exercise price	$ 7.20	$ 6.30
Options vested and exercisable intrinsic value	$ 5,551	$ 7,886
$4.31-$7.18
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range	$ 4.31
Range of exercise prices, upper range	$ 7.18
Number of shares vested and exercisable	261,442
Options vested and exercisable weighted average remaining contractual life	4 years 1 month 10 days
Options vested and exercisable weighted average exercise price	$ 5.93
Options vested and exercisable intrinsic value	$ 3,516
$7.44-$8.17
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range	$ 7.44
Range of exercise prices, upper range	$ 8.17
Number of shares vested and exercisable	17,550
Options vested and exercisable weighted average remaining contractual life	5 years 10 months 2 days
Options vested and exercisable weighted average exercise price	$ 7.72
Options vested and exercisable intrinsic value	$ 205
$8.65-$23.57
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	$ 23.57
Number of shares vested and exercisable	176,895
Options vested and exercisable weighted average remaining contractual life	6 years 8 months 17 days
Options vested and exercisable weighted average exercise price	$ 9.04
Options vested and exercisable intrinsic value	$ 1,830
$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 24 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 23 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 11 days
Options vested and exercisable weighted average exercise price		$ 8.76
Options vested and exercisable intrinsic value		$ 1,590

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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