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Debt (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  |  |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  |  |  |  | 12 Months Ended |  |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 sqft | Jun. 01, 2004 sqft | Dec. 31, 2012 Land owned [Member] | Dec. 31, 2011 Land owned [Member] | Dec. 31, 2012 Building [Member] | Dec. 31, 2011 Building [Member] | Dec. 31, 2012 April 26, 2014 [Member] | Dec. 31, 2011 April 26, 2014 [Member] | Dec. 31, 2012 December 20, 2018 [Member] | Dec. 31, 2011 December 20, 2018 [Member] | Dec. 20, 2011 December 20, 2018 [Member] | Dec. 31, 2012 Revolving credit facility [Member] | Oct. 26, 2012 Revolving credit facility [Member] | Dec. 31, 2011 Revolving credit facility [Member] | Dec. 31, 2012 Fixed rate notes [Member] | Dec. 31, 2011 Fixed rate notes [Member] | Dec. 31, 2012 Fixed rate notes [Member] April 26, 2014 [Member] | Dec. 31, 2012 Fixed rate notes [Member] December 20, 2018 [Member] | Dec. 31, 2012 Seven year fixed rate notes [Member] | Dec. 20, 2011 Seven year fixed rate notes [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 Maximum [Member] Revolving credit facility [Member] | Dec. 31, 2012 Maximum [Member] Seven year fixed rate notes [Member] October 26th Fixed rate debt [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Minimum [Member] October 26th Fixed rate debt [Member] | Dec. 31, 2012 Minimum [Member] Revolving credit facility [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin added to the interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% |  |  | 2.50% |  |
Fixed rate notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000 |  |  |  | 20,000 |  |  |  |  |  |  |
Other notes payable | 11,429 |  |  |  |  |  |  |  | 11,429 | 17,143 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |  | 20,000 | 20,000 |  |  |  |  |  |  |  |  |  | 20,000 |  |  |  |  |  |
Applicable margin added to the interest rate post amendment |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  | 2.25% |  |  |  | 1.25%
Expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 20, 2018 |  |  |  |  |  |  |  |
Senior notes maturity period |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized balance |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,012 |  | 1,761 | 157 | 290 |  |  |  |  |  |  |  |  |  |
Percentage of fixed interest rate bearing |  |  |  |  |  |  |  |  |  |  | 4.64% |  | 4.64% |  |  |  |  |  | 4.89% |  |  |  |  |  |  |  |  |
Fair value |  |  |  |  | 520 | 854 | 1,930 | 1,107 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of fixed interest rate bearing pre amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.39% |
Percentage of fixed interest rate bearing post amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.89% |  |  |
Line of credit LIBOR rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual principal payment of fixed rate notes |  |  |  |  |  |  |  |  |  |  | 4,000 |  |  |  |  |  |  |  | 5,714 |  |  |  |  |  |  |  |  |
Debt (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio current required minimum | 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential to expand credit facility under credit agreement | 35,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease of land and building |  |  | 75,000 | 110,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate non discounted lease payments over the twenty year term | 5,700 | 3,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of lease agreement | 20 years | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undiscounted annual lease payments | 287 | 185 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of credit facility to meet short term cash flow needs | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Method of determining interest rate under revolving credit facility | LIBOR plus an applicable margin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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