Issuance of Common Stock (Details) - USD ($) $ in Thousands	Jul. 30, 2018	Mar. 28, 2017
Equity [Abstract]
Common stock issued in transaction (in shares)	4,025,000	5,175,000
Net proceeds from issuance of common stock	$ 205,400	$ 136,600
Underwriting discounts and commissions	12,000	8,800
Other direct costs incurred	$ 366	$ 816