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Earnings (Loss) Per Share and Stockholders' Equity (Schedule of Earnings (Loss) Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Earnings Per Share, Basic and Diluted [Line Items] |  |  |
Net income (loss) - numerator for earnings (loss) per common share |  | $ 53,939 | $ (44,841)
Weighted average common shares outstanding (shares) | [1] | 88,647,078 | 82,128,911
Effect of dilutive securities: 2015 warrants (shares) |  | 0 | 60,878
Denominator for earnings (loss) per common share - assuming dilution |  | 89,975,612 | 82,961,495
Earnings (loss) per common share |  | $ 0.61 | $ (0.55)
Earnings (loss) per common share - assuming dilution |  | $ 0.60 | $ (0.55)
Stock Options and Deferred Compensation Agreements [Member] |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |
Effect of dilutive securities: share-based payment arrangements (shares) |  | 948,317 | 492,567
Restricted Stock and Restricted Stock Units [Member] |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |
Effect of dilutive securities: share-based payment arrangements (shares) |  | 380,217 | 279,139
[1] | Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan.

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