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Common Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 06, 2015 | Oct. 31, 2016 | May 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  | $ 95,000 | $ 109,600 | $ 53,000 | $ 228,011 | $ 92,260 | $ 73,302 |
ATM Program [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  |  | 23,800 |  |  |
Gross Amount Remaining To Be Issued |  |  |  |  | $ 36,200 |  |  |
Common Stock Average Price |  |  |  |  | $ 47.74 |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Registration Payment Arrangement, Maximum Potential Consideration |  |  |  |  |  |  |  | $ 500,000
Stock Issued During Period, Shares, New Issues |  | 2,087,250 | 2,875,000 | 1,725,000 |  |  |  |
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 |  |  |  |  | 499,209 |  |  |

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