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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Carrying Amounts and Fair Values of Company's Amended and Restated Senior Credit Facilities and Contingent Consideration Liabilities | The carrying amounts and fair values of the Company’s Amended and Restated Senior Credit Facility, 6.125% Senior Notes, 5.125% Senior Notes, 5.625% Senior Notes, 6.500% Senior Notes, other long-term debt and derivative instruments at March 31, 2019 and December 31, 2018 were as follows (in thousands):
|  | Carrying Amount |  |  | Fair Value |
|  | March 31, 2019 |  |  | December 31, 2018 |  |  | March 31, 2019 |  |  | December 31, 2018 |
Amended and Restated Senior Credit Facility |  | $ | 1,779,357 |  |  | $ | 1,715,338 |  |  | $ | 1,779,537 |  |  | $ | 1,715,338 |
6.125% Senior Notes due 2021 |  | $ | 148,803 |  |  | $ | 148,657 |  |  | $ | 148,803 |  |  | $ | 147,542 |
5.125% Senior Notes due 2022 |  | $ | 297,147 |  |  | $ | 296,946 |  |  | $ | 297,890 |  |  | $ | 283,583 |
5.625% Senior Notes due 2023 |  | $ | 643,651 |  |  | $ | 643,289 |  |  | $ | 647,674 |  |  | $ | 609,516 |
6.500% Senior Notes due 2024 |  | $ | 383,577 |  |  | $ | 383,304 |  |  | $ | 394,125 |  |  | $ | 369,888 |
Other long-term debt |  | $ | 5,677 |  |  | $ | 5,953 |  |  | $ | 5,677 |  |  | $ | 5,953 |
Derivative instrument assets |  | $ | 46,304 |  |  | $ | 60,524 |  |  | $ | 46,304 |  |  | $ | 60,524 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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