Quarterly report pursuant to Section 13 or 15(d)

Per Share Data and Stockholders' Equity - Dilutive Effect on Earnings Per Share (Details)

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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