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ACQUISITION OF MGE Part 3 - Preliminary Fair Value of Assets Acquired and Liabilities Assumed (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Sep. 30, 2012
Sep. 01, 2013
Missouri Gas Energy (MGE) [Member]
Assets:      
Utility plant     $ 671,793
Non-utility property     238
Other investments     3,096
Goodwill 247,078 0 247,078
Other Property and Investments     922,205
Accounts receivable:      
Utility     19,963
Other     6,119
Delayed customer billings     10,701
Inventories:      
Natural gas stored underground     58,679
Materials and supplies at average cost     3,988
Prepayments and other     487
Total Current Assets     99,937
Deferred Charges:      
Regulatory assets     84,014
Other     4,928
Total Deferred Charges     88,942
Total Assets Acquired     1,111,084
Liabilities:      
Accounts payable     20,154
Wages and compensation accrued     5,088
Customer deposits     8,362
Interest accrued     183
Taxes accrued     17,197
Other     12,620
Total Current Liabilities     63,604
Pension and postretirement benefit costs     24,466
Asset retirement obligations     32,056
Regulatory liabilities     2,249
Regulatory liabilities     13,709
Total Deferred Credits and Other Liabilities     72,480
Total Liabilities Assumed     136,084
Net Assets Acquired     $ 975,000