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Long-Term Debt (Tables)
3 Months Ended
Mar. 31, 2020
Long-Term Debt.  
Schedule of long-term debt

Long-term debt as of December 31, 2019 and March 31, 2020 consisted of the following items (in thousands):

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December 31,

​

March 31,

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2019

   

2020

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Credit Facility (a)

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$

552,000

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​

882,000

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5.375% senior notes due 2021 (b)

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​

952,500

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​

730,283

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5.125% senior notes due 2022 (c)

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​

923,041

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​

761,337

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5.625% senior notes due 2023 (d)

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​

750,000

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​

750,000

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5.00% senior notes due 2025 (e)

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​

600,000

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​

600,000

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Net unamortized premium

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​

791

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​

600

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Net unamortized debt issuance costs

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​

(19,464)

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​

(16,433)

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Long-term debt

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$

3,758,868

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​

3,707,787

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