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Investments (Details-1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Available-for-sale securities: |  |  |
Cost basis | $ 1,736 | $ 1,575 |
Gross unrealized gains | 629 | 161 |
Gross unrealized losses | 0 | (3) |
Fair Value | 2,365 | 1,733 |
Equity method investments: |  |  |
Equity method investments | 65,587 | 61,058 |
Other Investments | 0 | 1,804 |
Total investments | 67,952 | 64,595 |
Results of Investment Liquidation [Abstract] |  |  |
Proceeds from sale of investments | 39 | 0 | 260
Gain (loss) on sale of investments | 2 | 0 | 198
ATC [Member] |  |  |
Equity method investments: |  |  |
Equity method investments | 64,488 | 61,038 |
Other Equity Method Investments [Member] |  |  |
Equity method investments: |  |  |
Equity method investments | 1,099 | 20 |
MGE [Member] |  |  |
Available-for-sale securities: |  |  |
Cost basis | 490 | 490 |
Gross unrealized gains | 321 | 10 |
Gross unrealized losses | 0 | (3) |
Fair Value | 811 | 497 |
Equity method investments: |  |  |
Equity method investments | 64,488 | 61,058 |
Other Investments | 0 | 0 |
Total investments | 65,299 | 61,555 |
Results of Investment Liquidation [Abstract] |  |  |
Proceeds from sale of investments | 16 | 0 | 223
Gain (loss) on sale of investments | (3) | 0 | 171
MGE [Member] | ATC [Member] |  |  |
Equity method investments: |  |  |
Equity method investments | 64,488 | 61,038 |
MGE [Member] | Other Equity Method Investments [Member] |  |  |
Equity method investments: |  |  |
Equity method investments | $ 0 | $ 20 |

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