| Accounts Receivable [Text Block] |
ACCOUNTS RECEIVABLE
Following is a summary of Accounts receivable, net included in the accompanying Condensed Consolidated Balance Sheets (in thousands) as of: | | | | | | | | | | | | | | | Accounts | Unbilled | Less Allowance for | Accounts | June 30, 2013 | Receivable, Trade | Revenue | Doubtful Accounts | Receivable, net | Electric Utilities | $ | 45,250 |
| $ | 24,290 |
| $ | (630 | ) | $ | 68,910 |
| Gas Utilities | 38,749 |
| 13,192 |
| (1,074 | ) | 50,867 |
| Power Generation | 157 |
| — |
| — |
| 157 |
| Coal Mining | 2,503 |
| — |
| — |
| 2,503 |
| Oil and Gas | 8,373 |
| — |
| (19 | ) | 8,354 |
| Corporate | 1,935 |
| — |
| — |
| 1,935 |
| Total | $ | 96,967 |
| $ | 37,482 |
| $ | (1,723 | ) | $ | 132,726 |
|
| | | | | | | | | | | | | | | Accounts | Unbilled | Less Allowance for | Accounts | Dec. 31, 2012 | Receivable, Trade | Revenue | Doubtful Accounts | Receivable, net | Electric Utilities | $ | 54,482 |
| $ | 23,843 |
| $ | (527 | ) | $ | 77,798 |
| Gas Utilities | 31,495 |
| 39,962 |
| (222 | ) | 71,235 |
| Power Generation | 16 |
| — |
| — |
| 16 |
| Coal Mining | 2,247 |
| — |
| — |
| 2,247 |
| Oil and Gas | 11,622 |
| — |
| (19 | ) | 11,603 |
| Corporate | 799 |
| — |
| — |
| 799 |
| Total | $ | 100,661 |
| $ | 63,805 |
| $ | (768 | ) | $ | 163,698 |
|
| | | | | | | | | | | | | | | Accounts | Unbilled | Less Allowance for | Accounts | June 30, 2012 | Receivable, Trade | Revenue | Doubtful Accounts | Receivable, net | Electric Utilities | $ | 36,336 |
| $ | 25,726 |
| $ | (620 | ) | $ | 61,442 |
| Gas Utilities | 20,627 |
| 11,085 |
| (950 | ) | 30,762 |
| Power Generation | 197 |
| — |
| — |
| 197 |
| Coal Mining | 1,982 |
| — |
| — |
| 1,982 |
| Oil and Gas | 13,749 |
| — |
| (105 | ) | 13,644 |
| Corporate | 1,130 |
| — |
| — |
| 1,130 |
| Total | $ | 74,021 |
| $ | 36,811 |
| $ | (1,675 | ) | $ | 109,157 |
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