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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Statement [Abstract] |  |  |  |
Depreciation and amortization | $ 86,971 | $ 86,070 | $ 171,272 | $ 174,897
Non-cash stock-based compensation expense | $ 6,119 | $ 6,030 | $ 12,076 | $ 12,386

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