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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]            
Net income (loss) $ (4,565) $ (3,802) $ (2,558) $ 37 $ (8,367) $ (2,521)
Common Stock Class A [Member]            
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]            
Net Income (Loss) Available to Common Stockholders, Basic (4,519)   (2,532)   (8,283) (2,496)
Net Income (Loss) Available to Common Stockholders, Diluted $ (4,519)   $ (2,532)   $ (8,283) $ (2,496)
Weighted Average Number of Shares Outstanding, Basic 49,229   49,080   49,229 49,080
Weighted Average Number of Shares Outstanding, Diluted 49,280   49,109   49,280 49,109
Basic and diluted earnings (loss) per share (in dollars per share) $ (0.09)   $ (0.05)   $ (0.17) $ (0.05)
Common Stock Class B [Member]            
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]            
Net Income (Loss) Available to Common Stockholders, Basic $ (46)   $ (26)   $ (84) $ (25)
Net Income (Loss) Available to Common Stockholders, Diluted $ (46)   $ (26)   $ (84) $ (25)
Weighted Average Shares Outstanding, Basic and Diluted 1,002   1,002   1,002 1,002
Basic and diluted earnings (loss) per share (in dollars per share) $ (0.04)   $ (0.03)   $ (0.08) $ (0.03)