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Common Stock (Details Textual) (USD $) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 30, 2013 | Dec. 31, 2014 | Jan. 31, 2013
Class of Stock [Line Items] |  |  |  |  |  |
Registration Payment Arrangement, Maximum Potential Consideration |  |  | $ 250,000,000 us-gaap_RegistrationPaymentArrangementMaximumPotentialConsideration |  |  |
Stock Issued During Period, Value, New Issues | 73,302,109 us-gaap_StockIssuedDuringPeriodValueNewIssues | 93,393,049 us-gaap_StockIssuedDuringPeriodValueNewIssues | 35,042,226 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |
Proceeds From Issuance Of Common Stock | 73,302,116 us-gaap_ProceedsFromIssuanceOfCommonStock | 93,393,056 us-gaap_ProceedsFromIssuanceOfCommonStock | 35,042,235 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |
Common Stock [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | 1,650,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_EquityInterestIssuedOrIssuableByTypeAxis = us-gaap_CommonStockMember |  |
Proceeds From Issuance Of Common Stock |  |  |  | 48,758,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_EquityInterestIssuedOrIssuableByTypeAxis = us-gaap_CommonStockMember |  |
Common Stock [Member] | Over-Allotment Option [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  |  | 2,587,500 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_EquityInterestIssuedOrIssuableByTypeAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_OverAllotmentOptionMember | 1,725,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_EquityInterestIssuedOrIssuableByTypeAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_OverAllotmentOptionMember
Proceeds From Issuance Of Common Stock |  |  |  |  | $ 71,511,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_EquityInterestIssuedOrIssuableByTypeAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_OverAllotmentOptionMember | $ 44,954,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_EquityInterestIssuedOrIssuableByTypeAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_OverAllotmentOptionMember

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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + 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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- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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