Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Jul. 31, 2017
Treasury Stock [Abstract]
Authorized shares repurchase amount			$ 50,000
Repurchases of common stock (shares)	2.1
Treasury stock average cost per share (dollars per share)	$ 23.89
Repurchases of common stock	$ 50,000	$ 50,000