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Issuance of Common Stock (Details) - USD ($) $ in Thousands | Jul. 30, 2018 | Mar. 28, 2017
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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

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