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Common Stock (Details Textual) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
May 06, 2015 | Mar. 31, 2017 | Mar. 31, 2015
ATM Program [Member] |  |  |
Class of Stock [Line Items] |  |  |
Gross Amount Remaining To Be Issued |  | $ 36.2 |
Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Registration Payment Arrangement, Maximum Potential Consideration |  |  | $ 500.0
Common Stock [Member] | ATM Program [Member] |  |  |
Class of Stock [Line Items] |  |  |
Value Of Equity Instruments To Be Issued | $ 100.0 |  |

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- Definition Value of equity instruments to be issued during the reporting period. + References No definition available. + Details
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- Definition Describes the maximum potential amount of consideration, undiscounted, that could be transferred under the registration payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621 + Details
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