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Per Share Data and Stockholders' Equity - Dilutive Effect on Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Weighted Average Shares |  |  |
Weighted average common shares outstanding (shares) |  | 42,789 | 44,791
Stock compensation plans (shares) |  | 0 | 0
Diluted earnings (loss) (shares) |  | 42,789 | 44,791
From Continuing Operations |  |  |
Income (Loss) |  | $ (2,014) | $ (20)
Non-vested restricted stock |  | 0 | 0
Basic earnings (loss) |  | $ (2,014) | $ (20)
Earnings (loss) per share from continuing operations (usd per share) |  | $ (0.05) | $ 0.00
From Discontinued Operations |  |  |
Total revenues |  | $ (180) | $ (521)
Non-vested restricted stock |  | 0 | 0
Basic earnings (loss) |  | $ (180) | $ (521)
Earnings (loss) per share from discontinued operations (usd per share) |  | $ 0.00 | $ (0.01)
Net Income (Loss) |  |  |
Earnings (loss) |  | $ (2,194) | $ (541)
Non-vested restricted stock |  | 0 | 0
Basic earnings (loss) |  | $ (2,194) | $ (541)
Earnings (loss) per common share (usd per share) |  | $ (0.05) | $ (0.01)
Effect of dilutive securities: |  |  |
Income (Loss) From Continuing Operations, Diluted earnings (loss) |  | $ (2,014) | $ (20)
Income (Loss) From Discontinued Operations, Diluted earnings (loss) |  | (180) | (521)
Net Income (Loss), Diluted earnings (loss) |  | $ (2,194) | $ (541)
Earnings (loss) per share from continuing operations (usd per share) |  | $ (0.05) | $ 0.00
Earnings (loss) per share from discontinued operations (usd per share) |  | 0.00 | (0.01)
Earnings (loss) per common share (usd per share) |  | $ (0.05) | $ (0.01)
Class A common stock |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 100 |  |

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