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Related Party Transactions (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
SIGI
Dec. 31, 2012
SIGI
Dec. 31, 2011
SIGI
Dec. 31, 2013
Pluris, LLC
Dec. 31, 2012
Pluris, LLC
Dec. 31, 2011
Pluris, LLC
Dec. 31, 2010
Pluris, LLC
Dec. 31, 2013
Roger Newnham
Dec. 31, 2012
Roger Newnham
Dec. 31, 2011
Roger Newnham
Dec. 31, 2013
Lemmie Rockford
Dec. 31, 2012
Lemmie Rockford
Dec. 31, 2011
Lemmie Rockford
Dec. 31, 2013
Quality RE Partners
item
Dec. 31, 2012
Quality RE Partners
Related party transactions                                                            
Lease payments to related party                         $ 1,556 $ 1,342 $ 1,278 $ 907 $ 929 $ 910         $ 295 $ 292 $ 277 $ 90 $ 90 $ 90 $ 264 $ 31
Amount of the agreement to construct a wastewater facility for Pluris, LLC                                           6,100                
Related party revenues recognized                                     0 362 5,680                  
Net income $ 25,554 $ 23,193 $ 15,893 $ 10,040 $ 17,932 $ 17,948 $ 11,857 $ 10,530 $ 12,471 $ 19,348 $ 14,462 $ 12,278 $ 74,680 $ 58,267 $ 58,559       $ 0                      
Number of former shareholders owning leased property                                                         3  
Number of current employees owning leased property                                                         2