Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Jul. 27, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jul. 22, 2016	Jan. 06, 2016
Subsequent events
Cash dividend declared (in dollars per share)		$ 0.06	$ 0.06	$ 0.12	$ 0.11
Subsequent Event
Subsequent events
Cash dividend declared (in dollars per share)	$ 0.06
Maximum
Subsequent events
Repurchase of shares, dollar amount authorized							$ 5.0
Maximum | Subsequent Event
Subsequent events
Repurchase of shares, dollar amount authorized						$ 5.0