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Common Stock (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 31, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  |  | $ (432) | $ 107,987 |
Common Stock, Shares Authorized |  |  |  | 45,000,000 | 45,000,000 |  | 45,000,000
Common Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  | $ 162,900 |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 2,415,000 |  | 0 |  |
Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Forward Sale Agreement Expires Date |  | Mar. 01, 2019 |  |  |  |  |
Common Stock, Shares Authorized |  | 3,500,000 |  |  |  |  |
ATM Program [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Gross Amount Remaining To Be Issued |  |  |  |  | $ 250,000 |  |
ATM Program [Member] | Common Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Value Of Equity Instruments To Be Issued | $ 250,000 |  |  |  |  |  |

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