Stockholders' Equity - Treasury Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended			3 Months Ended
	Mar. 31, 2015	Feb. 28, 2015	Jan. 31, 2015	Mar. 31, 2015	Jan. 01, 2015
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	230,532	1,234	16,031	247,797
Average Price Paid Per Share	$ 17.34	$ 16.98	$ 16.92	$ 17.31
Approximate Dollar Value of Shares That May Yet Be Purchased Under the Publicly Announced Plans or Programs	$ 14,536	$ 14,708	$ 14,729	$ 14,536	$ 15,000
Common Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	10,202	1,234	16,031	27,467