v3.3.0.814

Quarterly Financial Information (Unaudited) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  | $ 100,718 | $ 71,583 | $ 57,441 | $ 36,532 | $ 22,942 | $ 16,994 | $ 11,980 | $ 6,318 |  |  |  |  |
Total operating expenses | $ 51,333 | 42,758 | 34,840 | 33,653 | 20,965 | 37,797 | 7,864 | 6,216 | 4,178 | $ 103,255 | $ 54,618 | $ 132,216 | $ 56,055 | $ 5,354
Operating income (loss) | $ 36,760 | 57,960 | 36,743 | 23,788 | 15,567 | (14,855) | 9,130 | 5,764 | 2,140 | $ 70,673 | $ 39,355 | 134,058 | 2,179 | (4,707)
Net income (loss) |  | $ 55,898 | $ 34,288 | $ 22,380 | $ 15,309 | $ (14,904) | $ 9,078 | $ 5,720 | $ 2,121 |  |  | $ 127,875 | $ 2,015 | $ (4,715)

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