Stock Incentive Plans - Summary of Stock Option Activity (Details) - 6 months ended Jun. 30, 2015 - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Total
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding and exercisable, beginning of period (in shares)	57
Exercised (in shares)	(32)
Outstanding and exercisable, end of period (in shares)	25
Weighted Average Exercise Price Per Share
Outstanding and exercisable as of beginning of period	$ 11.69
Exercised	11.78
Outstanding and exercisable as of end of period	$ 11.58
Exercised, total intrinsic value of options exercised	$ 359
Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding and exercisable, beginning of period (in shares)	22
Exercised (in shares)	(22)
Outstanding and exercisable, end of period (in shares)	0
2006 Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding and exercisable, beginning of period (in shares)	35
Exercised (in shares)	(10)
Outstanding and exercisable, end of period (in shares)	25