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Stockholders' Equity - Changes in common shares issued and treasury stock (Details) |  | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2013 Common Stock | Dec. 31, 2012 Common Stock | Sep. 30, 2013 Treasury Stock | Dec. 31, 2012 Treasury Stock | Dec. 31, 2011 Treasury Stock
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |
Balance (in shares) | 6,261,975 | 6,261,975 | 6,259,975 | 1,005,092 | 1,005,092 | 1,005,092
Issuance of shares for common stock grants |  | 0 | 2,000 |  |  |
Balance (in shares) | 6,261,975 | 6,261,975 | 6,261,975 | 1,005,092 | 1,005,092 | 1,005,092

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- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: 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 + Details
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- Definition Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References No definition available. + Details
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