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Selected Quarterly Financial Data (Unaudited) (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Selected Quarterly Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from discontinued operations, net of tax | $ 9,100 | $ 10,110 | $ (19,328) | $ 33,788 | $ 12,300 | $ 32,459 | $ 21,806 | $ 39,221 | $ 14,460 | $ 61,027 | $ 24,570 | $ 93,486 | $ 33,677 | $ 105,774 | $ 129,654
Long-lived asset impairment | 87,400 | 19,900 |  | $ 8,200 | $ 17,900 | 11,300 | 9,800 | 3,800 |  |  |  |  |  |  |
Restructuring charges | 3,200 | $ 300 |  |  |  | $ 200 | $ 400 | $ 4,800 |  |  |  |  | 43,884 | 2,159 | 0
Goodwill impairment loss | $ 3,700 |  |  |  |  |  |  |  |  |  |  |  | $ 3,738 | $ 0 | $ 0
April 2015 Contract Operations Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from discontinued operations, net of tax |  |  | (19,300) |  |  |  |  |  |  |  |  |  |  |  |
Long-lived asset impairment |  |  | 9,500 |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  | $ 1,200 |  |  |  |  |  |  |  |  |  |  |  |

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