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COMMITMENTS AND CONTINGENCIES (Details 2)
$ in Thousands
12 Months Ended
Jan. 26, 2016
state
Feb. 10, 2015
item
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Environmental Laws And Regulations          
Number of states initiating legal challenges to invalidate rule | state 25        
Asset retirement obligation     $ 15,072 $ 4,847 $ 4,190
Regulatory assets of Missouri solar initiative     209,708 $ 209,717  
Asbury Power Plant          
Environmental Laws And Regulations          
Asset retirement obligation     5,400    
Iatan Generating Station          
Environmental Laws And Regulations          
Asset retirement obligation     4,400    
Surface Impoundments | Electric | High end of range          
Environmental Laws And Regulations          
Potential cost for construction of new landfill and conversion of existing ash handling from wet to dry system(s)     $ 15,000    
Renewable Energy | Electric          
Environmental Laws And Regulations          
Minimum percentage of Missouri retail sales required to generate or purchase electricity in 2014     5.00%    
Minimum percentage of Missouri retail sales required to generate or purchase electricity by 2021     15.00%    
Percentage of Missouri retail sales required to generate or purchase solar energy     2.00%    
Number of laws harmonized | item   2      
Number of solar rebate applications processed in Missouri solar initiative | item     262    
Rebate Commitments in Missouri solar initiative     $ 3,500    
Regulatory assets of Missouri solar initiative     $ 3,500    
Percentage of Kansas retail customer peak capacity required to be sourced from renewable energy by 2020     20.00%    
Green House Gases          
Environmental Laws And Regulations          
Percentage of carbon emission reduction from 2005 baseline levels by 2030, required by the proposed Clean Power Plan     32.00%    
Number of plan types for states to choose to meet their goals | item     2