Share-Based Compensation (Summary of Stock Options Outstanding) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares vested and exercisable	487,628	612,225
Options vested and exercisable weighted average remaining contractual life	5 years 8 months 12 days	4 years 4 months 28 days
Options vested and exercisable weighted average exercise price	$ 8.58	$ 6.85
Options vested and exercisable intrinsic value	$ 6,570	$ 3,496
$4.81-$6.47
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range	$ 4.81
Range of exercise prices, upper range	$ 6.47
Number of shares vested and exercisable	77,400
Options vested and exercisable weighted average remaining contractual life	2 years 6 months 4 days
Options vested and exercisable weighted average exercise price	$ 5.48
Options vested and exercisable intrinsic value	1,282
$6.80-$8.65
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range	$ 6.80
Range of exercise prices, upper range	$ 8.65
Number of shares vested and exercisable	220,650
Options vested and exercisable weighted average remaining contractual life	4 years 10 months 10 days
Options vested and exercisable weighted average exercise price	$ 7.18
Options vested and exercisable intrinsic value	3,281
$9.13-$12.98
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range	$ 9.13
Range of exercise prices, upper range	$ 12.98
Number of shares vested and exercisable	189,578
Options vested and exercisable weighted average remaining contractual life	7 years 11 months 16 days
Options vested and exercisable weighted average exercise price	$ 11.46
Options vested and exercisable intrinsic value	2,007
$4.30-$4.81
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range		$ 4.30
Range of exercise prices, upper range		$ 4.81
Number of shares vested and exercisable		121,650
Options vested and exercisable weighted average remaining contractual life		1 year 10 months 28 days
Options vested and exercisable weighted average exercise price		$ 4.61
Options vested and exercisable intrinsic value		968
$5.02-$7.11
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range		$ 5.02
Range of exercise prices, upper range		$ 7.11
Number of shares vested and exercisable		254,925
Options vested and exercisable weighted average remaining contractual life		4 years 8 months 27 days
Options vested and exercisable weighted average exercise price		$ 6.41
Options vested and exercisable intrinsic value		1,569
$7.17-$9.19
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range		$ 7.17
Range of exercise prices, upper range		$ 9.19
Number of shares vested and exercisable		193,350
Options vested and exercisable weighted average remaining contractual life		4 years 9 months 4 days
Options vested and exercisable weighted average exercise price		$ 8.05
Options vested and exercisable intrinsic value		872
$10.34-$14.38
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range		$ 10.34
Range of exercise prices, upper range		$ 14.38
Number of shares vested and exercisable		42,300
Options vested and exercisable weighted average remaining contractual life		7 years 11 months 16 days
Options vested and exercisable weighted average exercise price		$ 10.49
Options vested and exercisable intrinsic value		$ 87