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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 SIGI | Dec. 31, 2011 SIGI | Dec. 31, 2010 SIGI | Dec. 31, 2012 Pluris, LLC | Dec. 31, 2011 Pluris, LLC | Dec. 31, 2010 Pluris, LLC | Dec. 31, 2012 Roger Newnham | Dec. 31, 2011 Roger Newnham | Dec. 31, 2010 Roger Newnham | Dec. 31, 2012 Lemmie Rockford | Dec. 31, 2011 Lemmie Rockford | Dec. 31, 2012 OMPP | Dec. 31, 2011 OMPP | Dec. 31, 2010 OMPP | Dec. 31, 2012 St. - Bernard Levee Partners | Dec. 31, 2011 St. - Bernard Levee Partners | Dec. 31, 2010 St. - Bernard Levee Partners | Dec. 31, 2012 Quality RE Partners item | Nov. 17, 2012 Alvah, Inc. | Dec. 31, 2012 Alvah, Inc. ARB | Dec. 31, 2012 Alvah, Inc. Q3C
Related party transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease payments to related party | $ 1,342 | $ 1,278 | $ 1,151 | $ 929 | $ 910 | $ 892 | $ 362 | $ 5,680 |  | $ 292 | $ 277 | $ 252 | $ 90 | $ 90 |  |  |  |  |  |  | $ 31 |  |  |
Amount of agreement to construct a wastewater facility |  |  |  |  |  |  |  |  | 6,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party revenues recognized | 502 | 5,681 | 1,568 |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 83 | 0 | 0 | 472 |  |  |  |
Number of former shareholders owning leased property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Number of current employees owning leased property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Membership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |
Subcontractor payments made to related party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,377 | $ 537

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