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Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument
Long-term debt	$ 1,628,814	$ 1,529,501
Senior Notes | 2027 Notes
Debt Instrument
Long term debt gross	500,000	0
Less: Deferred financing costs, net of amortization	(8,550)	0
Long-term debt	491,450	0
Senior Notes | 2022 Notes
Debt Instrument
Long term debt gross	350,000	350,000
Less: Deferred financing costs, net of amortization	(2,725)	(3,133)
Less: Deferred financing costs, net of amortization	(2,411)	(2,766)
Long-term debt	344,864	344,101
Senior Notes | 2021 Notes
Debt Instrument
Long term debt gross	0	350,000
Less: Deferred financing costs, net of amortization	0	(2,311)
Less: Deferred financing costs, net of amortization	0	(1,789)
Long-term debt	0	345,900
Revolving Credit Facility | Credit Facility
Debt Instrument
Long-term debt	$ 792,500	$ 839,500

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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