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Consolidated Statements of Stockholders' Equity (Parenthetical) (Preferred Stock) | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Preferred Stock |  |
Redemption of preference shares | 18,255 | 12,000

X
- Definition Number of stock bought back by the entity at the exercise price or redemption price. + 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
Name: | us-gaap_StockRedeemedOrCalledDuringPeriodShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration