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Public Stock Offering (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Feb. 06, 2018 | Mar. 30, 2019 | Mar. 31, 2018
Subsidiary Sale Of Stock [Line Items] |  |  |
Proceeds from stock issued |  | $ 408 | $ 240,163
Common stock [Member] |  |  |
Subsidiary Sale Of Stock [Line Items] |  |  |
Sale of stock |  |  | 4,400,000
Common stock [Member] | Public Offering [Member] |  |  |
Subsidiary Sale Of Stock [Line Items] |  |  |
Sale of stock | 4,400,000 |  |
Shares price per share | $ 57.50 |  |
Proceeds from stock issued | $ 239,793 |  |

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