Dividends and Earnings per Share - Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands							3 Months Ended		6 Months Ended
	Jun. 09, 2017	May 02, 2017	Mar. 24, 2017	Feb. 15, 2017	Apr. 14, 2016	Mar. 07, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Dividends declared (in dollars per share)		$ 0.04		$ 0.04		$ 0.08			$ 0.08
Dividends paid (in dollars per share)	$ 0.04		$ 0.04		$ 0.08		$ 0.04	$ 0	$ 0.08	$ 0.08
Total payment	$ 688		$ 688		$ 1,378				$ 1,376	$ 1,378