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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Cash and cash equivalents | $ 236,412 | $ 388,490
Current assets | 1,120,859 | 1,217,133
Total assets | 7,091,788 | 6,769,636
Current liabilities | 1,205,486 | 1,190,087
Liabilities | $ 3,972,212 | $ 4,704,294
Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Preferred stock, shares authorized (in shares) | 49,889,000 | 49,889,000
Preferred stock, shares issued (in shares) | 0 | 0
Preferred stock, shares outstanding (in shares) | 0 | 0
Class A Common Stock |  |
Common stock, par value (in dollars per share) | $ 0.004 | $ 0.004
Common stock, shares authorized (in shares) | 700,000,000 | 700,000,000
Common stock, shares issued (in shares) | 118,806,000 | 107,450,000
Common stock, shares outstanding (in shares) | 118,806,000 | 107,450,000
Class B Common Stock |  |
Common stock, par value (in dollars per share) | $ 0.004 | $ 0.004
Common stock, shares authorized (in shares) | 175,000,000 | 175,000,000
Common stock, shares issued (in shares) | 105,866,000 | 116,865,000
Common stock, shares outstanding (in shares) | 105,866,000 | 116,865,000
Variable Interest Entity, Primary Beneficiary |  |
Cash and cash equivalents | $ 69,692 | $ 158,387
Current assets | 424,040 | 483,613
Total assets | 1,133,619 | 1,196,813
Current liabilities | 190,725 | 207,977
Liabilities | $ 318,677 | $ 274,744

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