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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended																						12 Months Ended
	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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Represents the number of current employees out of the former shareholders who own leased property.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of transactions with related party during the financial reporting period.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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