Schedule of Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015
Class of Stock
Dividends declared per share (in usd per share)	$ 0.06	$ 0.06	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.17	$ 0.15
Common Stock
Class of Stock
Aggregate amount of dividends	$ 1,299	$ 1,300	$ 1,076	$ 1,076	$ 1,077	$ 1,073