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Common Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Apr. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Class of Stock [Line Items] |  |  |  |  |
Proceeds From Issuance Of Common Stock | $ 108,200 |  |  | $ 136,733 | $ 124,099
ATM Program [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  | $ 29,200 | 29,300 |
Gross Amount Remaining To Be Issued |  |  |  | $ 170,700 |
Common Stock Average Price |  |  | $ 49.58 | $ 49.57 |
Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 2,415,000 |  |  |  |
Common Stock [Member] | ATM Program [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Value Of Equity Instruments To Be Issued |  | $ 200,000 |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 589,093 | 591,593 |

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