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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income and Other Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | May 30, 2017
Accumulated other comprehensive items, net |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  | $ 0 | $ 38,869 |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance | $ (74,082) | $ (161,239) | (103,989) | (212,573) |
Other comprehensive loss: |  |  |  |  |
Foreign currency translation adjustments | (135,756) | 7,649 | (105,664) | 58,983 |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax | 2,388 | 0 | 2,203 | 0 |
Total Other comprehensive (loss) income | (133,368) | 7,649 | (103,461) | 58,983 |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance | (207,450) | (153,590) | (207,450) | (153,590) |
Total loss on foreign currency transactions | (18,624) | 20,199 | 3,161 | 16,035 |
Other, net | (432) | (39,565) | (2,066) | (41,765) |
Other (Income) Expense, Net | (19,056) | (19,366) | 1,095 | (25,730) |
Russia and Ukraine Divestment | Disposal Group, Not Discontinued Operations |  |  |  |  |
Accumulated other comprehensive items, net |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  | 38,869 |  | 38,869 |
Disposal group, cumulative translation adjustment |  | 29,100 |  | 29,100 | $ 29,100
Foreign currency translation adjustments |  |  |  |  |
Accumulated other comprehensive items, net |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance | (73,897) | (161,239) | (103,989) | (212,573) |
Other comprehensive loss: |  |  |  |  |
Foreign currency translation adjustments | (135,756) | 7,649 | (105,664) | 58,983 |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax | 0 |  | 0 |  |
Total Other comprehensive (loss) income | (135,756) | 7,649 | (105,664) | 58,983 |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance | (209,653) | $ (153,590) | (209,653) | $ (153,590) |
Market value adjustments for securities |  |  |  |  |
Accumulated other comprehensive items, net |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance | (185) |  | 0 |  |
Other comprehensive loss: |  |  |  |  |
Foreign currency translation adjustments | 0 |  | 0 |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax | 2,388 |  | 2,203 |  |
Total Other comprehensive (loss) income | 2,388 |  | 2,203 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance | $ 2,203 |  | $ 2,203 |  |

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