Stockholders' Equity - Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended						3 Months Ended	6 Months Ended
	Jun. 30, 2015	May. 31, 2015	Apr. 30, 2015	Mar. 31, 2015	Feb. 28, 2015	Jan. 31, 2015	Jun. 30, 2015	Jun. 30, 2015	Jan. 01, 2015
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	138,432	38,898	0	230,532	1,234	16,031		425,127
Average Price Paid Per Share	$ 16.98	$ 16.94	$ 0.00	$ 17.34	$ 16.98	$ 16.92		$ 17.17
Approximate Dollar Value of Shares That May Yet Be Purchased Under the Publicly Announced Plans or Programs	$ 11,531	$ 13,876	$ 14,536	$ 14,536	$ 14,708	$ 14,729	$ 11,531	$ 11,531	$ 15,000
Common Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	138,432	38,898	0	10,202	1,234	16,031	177,330	204,797