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Common Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
May 06, 2016 | May 31, 2016 | Sep. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Mar. 27, 2015
Class of Stock [Line Items] |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  | $ 109,700 |  | $ 124,099 | $ 38,795 |
ATM Program [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  | $ 12,200 | 14,900 |  |
Gross Amount Remaining To Be Issued |  |  |  | $ 45,800 |  |
Common Stock Average Price |  |  | $ 49.66 | $ 47.21 |  |
Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Registration Payment Arrangement, Maximum Potential Consideration |  |  |  |  |  | $ 500,000
Stock Issued During Period, Shares, New Issues |  | 2,875,000 |  |  |  |
Common Stock [Member] | ATM Program [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Value Of Equity Instruments To Be Issued | $ 100,000 |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 246,565 | 315,607 |  |

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