Share-Based Compensation (Summary of Stock Options Outstanding) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares vested and exercisable	476,133	493,050
Options vested and exercisable weighted average remaining contractual life	5 years 5 months 16 days	4 years 10 months 6 days
Options vested and exercisable weighted average exercise price	$ 8.59	$ 7.27
Options vested and exercisable intrinsic value	$ 8,557	$ 2,797
$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	74,100
Options vested and exercisable weighted average remaining contractual life	2 years 3 months 7 days
Options vested and exercisable weighted average exercise price	$ 5.50
Options vested and exercisable intrinsic value	1,561
$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	209,850
Options vested and exercisable weighted average remaining contractual life	4 years 6 months 29 days
Options vested and exercisable weighted average exercise price	$ 7.18
Options vested and exercisable intrinsic value	4,067
$9.13-$13.05
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	$ 13.05
Number of shares vested and exercisable	192,183
Options vested and exercisable weighted average remaining contractual life	7 years 7 months 28 days
Options vested and exercisable weighted average exercise price	$ 11.32
Options vested and exercisable intrinsic value	2,929
$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		140,025
Options vested and exercisable weighted average remaining contractual life		2 years 10 months 24 days
Options vested and exercisable weighted average exercise price		$ 5.29
Options vested and exercisable intrinsic value		1,072
$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		277,125
Options vested and exercisable weighted average remaining contractual life		4 years 11 months 5 days
Options vested and exercisable weighted average exercise price		$ 7.43
Options vested and exercisable intrinsic value		1,527
$9.13-$11.17
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		$ 11.17
Number of shares vested and exercisable		73,650
Options vested and exercisable weighted average remaining contractual life		8 years 1 month 21 days
Options vested and exercisable weighted average exercise price		$ 10.28
Options vested and exercisable intrinsic value		196
$12.20-$14.38
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range		$ 12.20
Range of exercise prices, upper range		$ 14.38
Number of shares vested and exercisable		2,250
Options vested and exercisable weighted average remaining contractual life		8 years 2 months 5 days
Options vested and exercisable weighted average exercise price		$ 12.20
Options vested and exercisable intrinsic value		$ 2