Stock-Based Compensation (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	May. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved and authorized maximum number of shares to be issued					3,000,000
Compensation expense related to stock based awards outstanding	$ 510,000	$ 375,000	$ 1,300,000	$ 800,000
Exercise of stock options, shares	0	33,908	3,970	54,922
Proceeds received upon exercise of stock options	$ 0	$ 203,000	$ 28,000	$ 340,000
Total unrecognized compensation expense	$ 2,800,000		$ 2,800,000
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