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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Accounts receivable, allowance for doubtful accounts (in dollars) | $ 1,933 | $ 1,523
Accumulated depreciation (in dollars) | $ 115,884 | $ 105,134
Stock Issued During Period, Shares, Convertible Preferred Shares | 90,220,000 |
Common stock, shares issued | 56,260,322 | 52,802,058
Convertible Preferred Stock [Member] | Series 4 Convertible Preferred Stock [Domain] |  |
Preferred Stock, Liquidation Preference, Value | $ 97,417 | $ 0
Stock Issued During Period, Shares, Convertible Preferred Shares | 95,000 | 0
Shares, Outstanding | 95,000 | 0
Common Stock [Member] |  |
Shares, Outstanding | 56,260,322 | 52,802,058
Common stock, shares outstanding | 56,260,322 | 52,802,058
Common Stock [Member] | Common Class A |  |
Shares, Outstanding | 56,256,567 | 52,798,303
Common Stock [Member] | Common Class B |  |
Shares, Outstanding |  | 3,755
Share Capital To Be Issued [Member] |  |
Shares to be issued, shares | 0 | 100,000

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