Common Stock Transactions (Details) - Common Stock - Private placement $ / shares in Units, $ in Millions		1 Months Ended
	Mar. 17, 2017	Mar. 31, 2016 USD ($) director item $ / shares shares
Number of shares issued | shares		4,404,658
Price per share of common stock | $ / shares		$ 35.19
Number of directors | director		3
Proceeds from issuance of private placement | $		$ 155.0
Number of days for calculating weighted average price per share	10 days
Number of placement agents used | item		0