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Equity Investment in Savoy (Condensed Statement of Operations - Savoy) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenue | $ 64,853 | $ 82,013 | $ 95,253 | $ 98,001 | $ 100,622 | $ 66,322 |  | $ 38,460 | $ 35,767 | $ 340,120 |  | $ 241,171 |  | $ 153,870 |
Expenses |  |  |  |  |  |  |  |  |  | (312,550) |  | (230,470) |  | (124,272) |
Net income | $ 544 | $ 5,144 | $ 6,853 | $ 7,591 | $ 9,393 | $ (5,768) | [1] | $ 3,068 | $ 3,526 | 20,132 | [2] | 10,219 | [2] | 22,423 | [2]
Savoy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 13,075 |  | 41,583 |  | 42,248 |
Expenses |  |  |  |  |  |  |  |  |  | (16,824) |  | (29,354) |  | (29,322) |
Net income |  |  |  |  |  |  |  |  |  | $ (3,749) |  | $ 12,229 |  | $ 12,926 |
[1] | Includes $8.9 million related to Vectren deal costs.
[2] | *There is no material difference between net income and comprehensive income.

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