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Long-Term Debt (Tables) | 6 Months Ended
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Jun. 30, 2019
Debt Disclosure [Abstract] |
Components of Long-term debt | Long-term debt consisted of the following:
(in thousands) |  | As of June 30, 2019 |  | As of December 31, 2018
Revolving credit facility |  | $ | 120,000 |  |  | $ | — |
Senior unsecured notes, due in 2025 |  | 400,000 |  |  | 400,000 |
Term loan B |  | 294,750 |  |  | 296,250 |
Term loan B-1 |  | 763,088 |  |  | — |
Total outstanding principal |  | 1,577,838 |  |  | 696,250 |
Less: Debt issuance costs and issuance discounts |  | (29,339 | ) |  | (7,486 | )
Less: Current portion |  | (10,650 | ) |  | (3,000 | )
Net carrying value of long-term debt |  | $ | 1,537,849 |  |  | $ | 685,764 |
Fair value of long-term debt * |  | $ | 1,437,995 |  |  | $ | 662,844 |
* Fair value of the 2025 Senior Notes is estimated based on quoted private market transactions and is classified as Level 1 in the fair value hierarchy. The fair values of the term loans are based on observable estimates provided by third party financial professionals, and as such, are classified within Level 2 of the fair value hierarchy.

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