Stock-Based Compensation - Narrative (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved and authorized maximum number of shares to be issued	3,000,000		3,000,000
Compensation expense related to stock based awards outstanding	$ 375,000	$ 548,000	$ 800,000	$ 1,100,000
Proceeds received upon exercise of stock options	203,000	302,000	340,000	510,000
Exercise of stock options, shares	33,908	63,134	54,922	97,100
Total unrecognized compensation expense	$ 1,600,000		$ 1,600,000
Share-based compensation cost not yet recognized, period for recognition			2 years
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, expiration period			10 years
Minimum | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, vesting period			3 years
Maximum | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, vesting period			5 years