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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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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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