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Long-Term Debt - Schedule of Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt | $ 817,940 | $ 456,900
Financing leases | 543 | 0
Less: Current portion | 14,385 | 18,336
Total long-term debt | 803,555 | 438,564
Revolving line of credit |  |
Debt Instrument [Line Items] |  |
Total debt | 269,000 | 312,000
Term loan, net of deferred debt issuance costs of $1,826 and $311 in 2019 and 2018, respectively |  |
Debt Instrument [Line Items] |  |
Total debt | 263,174 | 144,064
Unamortized debt issuance cost | 1,826 | 311
2.625% convertible notes, net of deferred debt issuance costs of $10,508 and unamortized discount of $50,105 in 2019 |  |
Debt Instrument [Line Items] |  |
Convertible Debt | 284,387 | 0
Unamortized debt issuance cost | 10,508 | 0
Unamortized discount | 50,105 | 0
Mortgage notes |  |
Debt Instrument [Line Items] |  |
Total debt | $ 836 | $ 836

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