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Basis of Presentation and Summary of Significant Accounting Policies Leases, Impact of New Accounting Standard Adoption (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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Leases, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Prepaid expenses and other current assets | $ 127,630 | $ 128,926 |
Intangible assets, net | 7,225,974 | 7,487,536 | $ 7,488,194
Other assets | 249,039 | 245,449 |
Accrued expenses and other current liabilities | 445,913 | 427,539 | 398,079
Other liabilities | $ 297,874 | 234,771 |
Calculated under Lease Guidance in Effect before ASC 842 [Member] |  |  |
Leases, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Prepaid expenses and other current assets |  |  | 129,811
Intangible assets, net |  |  | 7,488,194
Other assets |  |  | 120,279
Accrued expenses and other current liabilities |  |  | 398,079
Other liabilities |  |  | $ 140,604
Accounting Standards Update 2016-02 [Member] | Difference between Lease Guidance in Effect before and after ASC 842 [Member] |  |  |
Leases, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Prepaid expenses and other current assets |  | (885) |
Intangible assets, net |  | (658) |
Other assets |  | 125,170 |
Accrued expenses and other current liabilities |  | 29,460 |
Other liabilities |  | $ 94,167 |

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