XML 56 R16.htm IDEA: XBRL DOCUMENT v2.3.0.15
Property, Plant and Equipment
9 Months Ended
Sep. 30, 2011
Property Plant And Equipment [Abstract] 
Property Plant And Equipment Disclosure Text Block

11.       Property, Plant and Equipment

 

The following table sets forth the major classifications of our property, plant and equipment and accumulated depreciation as of September 30, 2011 and 2010 and December 31, 2010:

   September 30, December 31,
Thousands 2011 2010 2010
Utility plant in service $ 2,296,788 $ 2,222,222 $ 2,247,952
Utility construction work in progress   36,459   33,359   29,324
Less: Accumulated depreciation   740,378   700,193   710,214
 Utility plant-net   1,592,869   1,555,388   1,567,062
Non-utility plant in service   290,075   66,299   290,038
Non-utility construction work in progress   9,176   206,823   9,088
Less: Accumulated depreciation   16,214   10,853   12,025
 Non-utility plant-net $ 283,037 $ 262,269 $ 287,101
           
Total property, plant and equipment $ 1,875,906 $ 1,817,657 $ 1,854,163