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Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2017 | Apr. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  | $ 339,744 | $ 222,695 | $ 228,011 |
Common Stock, Shares Authorized |  |  |  | 45,000,000 | 45,000,000 |  |
Common Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 2,415,000 |  | 6,507,263 | 4,786,604 | 5,461,459 |
Proceeds From Issuance Of Common Stock |  | $ 108,000 |  |  |  |  |
Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 3,450,000 |  |  |  |  |  |
Proceeds From Issuance Of Common Stock | $ 160,200 |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  | 3,450,000
Common Stock [Member] | Forward Contracts Two [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common Stock, Shares Authorized | 3,500,000 |  |  |  |  |  |
ATM Program [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  | $ 181,200 |  |  |
Gross Amount Remaining To Be Issued |  |  |  | $ 68,800 |  |  |
Common stock Average Price |  |  |  | $ 59.28 |  |  |
Over-Allotment Option [Member] | Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  | 450,000
Common Stock [Member] | ATM Program [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 3,057,263 |  |  |
Value Of Equity Instruments To Be Issued |  |  | $ 250,000 |  |  |  |

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