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Basis of Presentation - Early Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |
Decrease in operating expenses | $ (339,289) | $ (317,242) | $ (675,248) | $ (625,578)
Total non-operating (expense) income | (76,897) | (65,701) | (135,855) | (123,563)
Effect of Accounting Change | Accounting Standards Update 2017-06 |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |
Decrease in operating expenses | 1,900 | 2,600 | 3,300 | 4,000
Total non-operating (expense) income | $ (1,900) | $ (2,600) | $ (3,300) | $ (4,000)

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