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Summary of Significant Accounting Policies (Summary of Changes in Accumulated Balances of Other Comprehensive Loss) (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
USD ($)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Beginning Balance, Estimated tax (expense) benefit $ (415)
Other comprehensive income (loss) before reclassifications, Estimated tax (expense) benefit (19)
Amount of loss (gain) reclassified from accumulated other comprehensive loss, Estimated tax (expense) benefit 415
Net current period other comprehensive income (loss), Estimated tax (expense) benefit 396
Ending Balance, Estimated tax (expense) benefit (19)
Beginning Balance (282,851)
Other comprehensive income (loss) before reclassifications, net of tax (99,432)
Amount of loss (gain) reclassified from accumulated other comprehensive loss, net of tax (3,497)
Net current period other comprehensive income (loss), net of tax (102,929)
Ending Balance (385,780)
Unrealized (Losses) Gains on Hedging Activities, Net [Member]  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Other comprehensive income (loss) before reclassifications, before tax 2,406
Amount of loss (gain) reclassified from accumulated other comprehensive loss, before tax (2,701)
Net current period other comprehensive income (loss), before tax (295)
Ending Balance (295)
Unrealized (Loss) Gains on Investments [Member]  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Beginning Balance 1,211
Other comprehensive income (loss) before reclassifications, before tax 161
Amount of loss (gain) reclassified from accumulated other comprehensive loss, before tax (1,211)
Net current period other comprehensive income (loss), before tax (1,050)
Ending Balance 161
Foreign Currency Translation [Member]  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Beginning Balance (283,647)
Other comprehensive income (loss) before reclassifications, before tax (101,980)
Net current period other comprehensive income (loss), before tax (101,980)
Ending Balance $ (385,627)