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Acquisitions - Blackhawk Acquisition, Pro-Forma Schedule (Details) - Blackhawk - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Revenue | $ 544,798 | $ 1,109,559
Net income (loss) applicable to common shares | $ (161,527) | $ 68,215
Income (loss) per common share: |  |
Basic (USD per share) | $ (0.86) | $ 0.41
Diluted (USD per share) | $ (0.86) | $ 0.42

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