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Commitments and Contingencies - Regulations (Details)
$ in Thousands
6 Months Ended
Jan. 09, 2016
state
Jun. 30, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Environmental Laws And Regulations      
Number of states initiating legal challenges to invalidate rule | state 27    
Regulatory assets of Missouri solar initiative   $ 209,682 $ 209,708
Surface Impoundments | Asbury Power Plant | Electric      
Environmental Laws And Regulations      
Asset retirement obligation   5,400  
Compliance costs   15,000  
Surface Impoundments | Iatan | Electric      
Environmental Laws And Regulations      
Asset retirement obligation   $ 4,400  
Renewable Energy | Electric      
Environmental Laws And Regulations      
Minimum percentage of Missouri retail sales required to generate or purchase electricity in 2014-2017   5.00%  
Minimum percentage of Missouri retail sales required to generate or purchase electricity by 2018-2020   10.00%  
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 solar rebate applications processed in Missouri solar initiative | item   748  
Rebate Commitments in Missouri solar initiative   $ 10,300  
Regulatory assets of Missouri solar initiative   $ 10,300  
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