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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Accounts receivable, allowance for doubtful accounts (in dollars) | $ 1,682 | $ 1,523
Accumulated depreciation (in dollars) | $ 109,667 | $ 105,134
Stock Issued During Period, Shares, Convertible Preferred Shares | 90,220,000 |
Common stock, shares issued | 53,381,692 | 52,802,058
Series 4 Convertible Preferred Stock [Domain] |  |
Stock Issued During Period, Shares, Convertible Preferred Shares | 95,000 |
Convertible Preferred Stock [Member] | Series 4 Convertible Preferred Stock [Domain] |  |
Preferred Stock, Liquidation Preference, Value | $ 95,507 | $ 0
Stock Issued During Period, Shares, Convertible Preferred Shares | 95,000 | 0
Shares, Outstanding | 95,000 | 0
Common Stock [Member] |  |
Shares, Outstanding | 53,381,692 | 52,802,058
Common stock, shares outstanding | 53,381,692 | 52,802,058
Common Stock [Member] | Common Class A |  |
Shares, Outstanding | 53,377,937 | 52,798,303
Common Stock [Member] | Common Class B |  |
Shares, Outstanding | 3,755 | 3,755
Share Capital To Be Issued [Member] |  |
Shares to be issued, shares | 0 | 100,000

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