Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Mar. 21, 2018	Mar. 01, 2018	Jul. 22, 2015
Subsequent Event [Line Items]
Increase in authorized amount of stock to be repurchased			$ 50.0
Subsequent Event [Member] | Common Class A
Subsequent Event [Line Items]
Dividend declared per share (in Dollars per share)		$ 0.15
Authorized amount of stock to be repurchased	$ 61.4
Subsequent Event [Member] | Common Stock
Subsequent Event [Line Items]
Dividend declared per share (in Dollars per share)		$ 0.15
Increase in authorized amount of stock to be repurchased	$ 50.0