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Recent Accounting Developments - Balance Sheet Impact (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets |  |  |
Accounts receivable, trade | $ 130,596 | $ 121,299 | $ 113,416
Inventory | 82,470 | 83,774 | 90,691
Contract costs | 31,240 | 21,524 | 0
Liabilities |  |  |
Accounts payable, trade | 91,818 |  | 54,585
Accrued liabilities | 67,152 | 71,325 | 71,116
Deferred revenue | 8,859 | 8,046 | 4,858
Deferred income taxes | 2,568 | 102,370 | 97,943
Other long-term liabilities | 17,536 |  | 20,116
Equity |  |  |
Additional paid-in capital | 3,150,118 |  | 3,093,058
Accumulated deficit | (2,252,349) | (2,226,577) | $ (2,241,243)
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |
Assets |  |  |
Accounts receivable, trade | 115,923 |  |
Inventory | 97,463 |  |
Contract costs | 0 |  |
Liabilities |  |  |
Accounts payable, trade | 91,776 |  |
Accrued liabilities | 66,930 |  |
Deferred revenue | 7,037 |  |
Deferred income taxes | 2,329 |  |
Other long-term liabilities | 17,514 |  |
Equity |  |  |
Additional paid-in capital | 3,140,754 |  |
Accumulated deficit | (2,271,558) |  |
Adjustments Due to the Revenue Recognition Update | ASU 2014-09 |  |  |
Assets |  |  |
Accounts receivable, trade | 14,673 | 7,883 |
Inventory | (14,993) | (6,917) |
Contract costs | 31,240 | 21,524 |
Liabilities |  |  |
Accounts payable, trade | 42 |  |
Accrued liabilities | 222 | 209 |
Deferred revenue | 1,822 | 3,188 |
Deferred income taxes | 239 | 4,427 |
Other long-term liabilities | 22 |  |
Equity |  |  |
Additional paid-in capital | 9,364 |  |
Accumulated deficit | $ 19,209 | $ 14,666 |

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