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Summary of Significant Accounting Policies and Other Information - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016
Inventories, Net |  |  |  |  |  |  |  |  |  |
Raw materials | $ 71,732 | $ 70,498 | $ 102,912 | $ 92,360 |  |  |  |  |  |
Work in process | 4,535 | 9,270 | 12,315 | 6,021 |  |  |  |  |  |
Finished goods | 16,684 | 30,862 | 52,136 | 11,904 |  |  |  |  |  |
Total Inventories | 92,951 | 110,630 | 167,363 | 110,285 |  |  |  |  |  |
Inventory allowance | (6,227) | (10,082) | (5,268) | (4,035) |  |  |  |  |  |
Inventories, net | 86,724 | 100,548 | 162,095 | 106,250 | $ 113,074 | $ 103,335 | $ 97,286 | $ 111,133 | $ 115,062 | $ 139,519
Allowance for Doubtful Accounts Receivable |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | 10,082 | 5,268 | 4,035 | 2,982 |  |  |  |  |  |
Charged to expense | 421 | 5,341 | 1,712 | 1,856 |  |  |  |  |  |
Write-offs | (4,276) | (527) | (479) | (803) |  |  |  |  |  |
Balance at end of year | $ 6,227 | $ 10,082 | $ 5,268 | $ 4,035 |  |  |  |  |  |

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