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Goodwill and Intangible Assets, Net (Summary of Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Write-off related to discontinued project | $ 0 | $ 4,754 | $ 0
Accumulated amortization | (102,488) | (95,402) |
Net carrying amount of finite-lived intangible assets | 41,707 |  |
Intangible assets, gross | 148,178 | 151,829 |
Intangible assets, net | $ 45,690 | 56,427 |
Weighted average remaining useful life of intangible assets | 6 years 6 months 20 days |  |
Capitalized software |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount of finite-lived intangible assets | $ 138,857 | 143,275 |
Accumulated amortization | (97,900) | (90,219) |
Net carrying amount of finite-lived intangible assets | 40,957 | 53,056 |
Patents, copyrights, and trademarks |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount of finite-lived intangible assets | 5,338 | 5,636 |
Accumulated amortization | (4,588) | (4,969) |
Net carrying amount of finite-lived intangible assets | 750 | 667 |
Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount of finite-lived intangible assets | 0 | 214 |
Accumulated amortization | 0 | (214) |
Net carrying amount of finite-lived intangible assets | 0 | 0 |
In progress |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | 3,906 | 2,378 |
Trademarks and other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | $ 77 | $ 326 |
Minimum | Capitalized software |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life | 2 years |  |
Maximum | Capitalized software |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life | 8 years |  |

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