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Related Party Transactions (Details) (USD $) | 1 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Aug. 31, 2011 | May 31, 2011 | Aug. 31, 2010 | Dec. 31, 2012 Rent_Property Lease_Property | Dec. 31, 2011 | Dec. 31, 2010 | Aug. 31, 2012 Trust [Member] | Aug. 31, 2012 Mckenna [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Purchase of common shares | 7,408 | 12,000 | 29,842 | 32,687 | 50,334 | 52,392 | 32,687 | 30,410 | 4,100
Common shares price per share | $ 54.71 | $ 63.72 | $ 69.21 | $ 32.43 |  |  |  | $ 54.92 | $ 55.91
Number of trading days to be considered for average price of stock repurchased | 30 days | 30 days | 30 days | 30 days |  |  |  | 30 days | 30 days
Related Party Transactions (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Service expense |  |  |  |  | $ 700,000 | $ 500,000 | $ 200,000 |  |
Compensation payment received |  |  |  |  |  | 184,608 |  |  |
Ryan Ruhlman employee years of service |  |  |  |  |  | 6 years |  |  |
Compensation attributable to stock option |  |  |  |  |  | 99,600 |  |  |
Related party transactions number of property leased |  |  |  |  | 2 |  |  |  |
Related party transaction lease expenses |  |  |  |  | 300,000 | 300,000 | 100,000 |  |
Related party transactions number of property rented |  |  |  |  | 2 |  |  |  |
Rent Expenses |  |  |  |  | 300,000 | 300,000 | 200,000 |  |
Labor expense |  |  |  |  | 700,000 | 700,000 | 600,000 |  |
Maintenance and building expenses |  |  |  |  | $ 0 | $ 200,000 | $ 200,000 |  |
Ownership percentage owned by related party |  |  |  |  | 50.00% |  |  |  |

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 5: 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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