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Stockholders' Equity (Details Textual) (USD $) In Thousands, except Per Share data, unless otherwise specified |  |  |  | 9 Months Ended
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Sep. 30, 2013 | Dec. 31, 2012 | Jul. 31, 2012 | Sep. 30, 2012 Common Stock [Member]
Stockholders' Equity [Line Items] |  |  |  |  |
Issuance of stock, shares |  |  |  | 2,645 | [1]
Common stock, par or stated value per share | $ 0.01 | $ 0.01 |  |  |
Sale of stock, price per share |  |  | $ 34.75 |  |
[1] | (1) In July 2012, we issued a public offering of 2,645,000 shares of common stock, par value $0.01 per share, at a price to the public of $34.75 per share.

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Number of new stock issued during the period. + 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 -Article 5 + Details
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