Equity (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Securities Repurchase Program
Repurchase of common stock	$ 2.7
Share Repurchase Program
Securities Repurchase Program
Repurchased shares | shares	50,000
Repurchase of common stock	$ 2.7
Repurchased shares, average price (in dollars per share) | $ / shares	$ 53.03
Amount authorized to be repurchased	$ 29.5
Common Stock
Securities Repurchase Program
Repurchased shares | shares	50,000