Stockholders' Equity (Additional Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Stockholders Equity Note [Line Items]
Payment of dividends			$ 4,110	$ 4,077
Common Stock, Dividends, Per Share, Declared	$ 0.12	$ 0.12	$ 0.24	$ 0.23