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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Tax Credit Carryforward [Line Items] |  |  |  |  |
Transition tax |  |  | $ 43,379,000 |  |
Transition tax for foreign earnings, provisional income tax expense |  |  | 48,126,000 |  |
Decrease in transition tax | $ (4,747,000) |  |  |  |
Transition tax for accumulated foreign earnings, provisional liability, noncurrent |  | $ 30,263,000 | 44,366,000 |  |
Change in tax rate |  | 1,422,000 | 1,281,000 | $ 111,000 |
Transition tax for accumulated foreign earnings |  | (521,820,000) | (1,281,000) |  |
Increase in income tax expense | $ 141,000 |  |  |  |
Foreign derived intangible income benefit |  | 7,930,000 | 0 | 0 |
Global intangible low-taxed income |  | 5,955,000 | 0 | 0 |
Transition tax for accumulated foreign earnings, amount subject to tax |  | 1,084,000 |  |  |
Deferred tax liabilities, withholding and dividend tax, foreign |  | 2,225,000 |  |  |
Undistributed earnings of foreign subsidiaries |  | 930,993,000 | 1,266,000,000 |  |
Penalties and interest expense |  | 631,000 | 121,000 | (163,000) |
Accrued penalties and interest |  | 1,419,000 | 789,000 |  |
Cash and cash equivalents |  | 544,358,000 | 909,900,000 | 623,855,000 | $ 582,532,000
Short-term investments |  | 500,432,000 | 206,257,000 |  |
Menara Networks |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Operating loss carry-forwards |  | 12,577,000 | 16,202,000 | $ 22,242,000 |
Operating loss carry-forwards, valuation allowance |  | 0 |  |  |
Her Majesty's Revenue and Customs (HMRC) | Foreign Tax Authority |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Operating loss carry-forwards |  | 2,888,000 |  |  |
State |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Tax credit carry-forwards |  | 11,801,000 | $ 10,294,000 |  |
Tax credit carryforward, valuation allowance |  | 7,439,000 |  |  |
United States |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 243,400,000 |  |  |
Short-term investments |  | 500,400,000 |  |  |
Foreign locations |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 301,000,000.0 |  |  |

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