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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 72,509 | $ 79,458 | $ 85,177 | $ 79,954 | $ 70,604 | $ 64,337 | $ 64,079 | $ 63,812 | $ 317,098 | $ 262,832 | $ 269,966
Income (loss) from operations | 2,123 | (3,103) | (1,252) | (623) | (5,575) | (2,253) | 156 | 368 | (2,855) | (7,304) | 12,278
Income (loss) from continuing operations | (7,767) | (3,421) | (1,122) | (743) | 3,917 | (1,870) | (111) | (29) | (13,053) | 1,907 | 7,158
Loss from discontinued operations, net of tax | (722) | 319 | (2,704) | (11,235) | (17,836) | (876) | (2,169) | (30,156) | (14,342) | (51,037) | (20,620)
Net loss | $ (8,489) | $ (3,102) | $ (3,826) | $ (11,978) | $ (13,919) | $ (2,746) | $ (2,280) | $ (30,185) | $ (27,395) | $ (49,130) | $ (13,462)
Basic earnings (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) | $ (0.14) | $ (0.06) | $ (0.02) | $ (0.01) | $ 0.07 | $ (0.03) | $ 0.00 | $ 0.00 | $ (0.23) | $ 0.03 | $ 0.13
Discontinued operations (in dollars per share) | (0.01) | 0.01 | (0.05) | (0.19) | (0.31) | (0.02) | (0.04) | (0.55) | (0.25) | (0.91) | (0.38)
Basic earnings (loss) per common share (in dollars per share) | (0.15) | (0.05) | (0.07) | (0.20) | (0.24) | (0.05) | (0.04) | (0.55) | (0.48) | (0.88) | (0.25)
Diluted earnings (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) | (0.14) | (0.06) | (0.02) | (0.01) | 0.07 | (0.03) | 0.00 | 0.00 | (0.23) | 0.03 | 0.13
Discontinued operations (in dollars per share) | (0.01) | 0.01 | (0.05) | (0.19) | (0.31) | (0.02) | (0.04) | (0.55) | (0.25) | (0.91) | (0.37)
Diluted earnings (loss) per common share (in dollars per share) | $ (0.15) | $ (0.05) | $ (0.07) | $ (0.20) | $ (0.24) | $ (0.05) | $ (0.04) | $ (0.55) | $ (0.48) | $ (0.88) | $ (0.24)

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