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Long-Term Debt - Redemption of 2021 Notes (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 05, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Instrument
Repayments of long-term debt				$ 1,151,000	$ 343,636
Debt extinguishment loss		$ 3,653	$ 2,450	3,653	$ 2,450
Senior Notes | 2021 Notes
Debt Instrument
Redemption rate (as a percent)	100.00%
Repayments of long-term debt	$ 350,000
Interest paid	$ 200
Debt extinguishment loss		$ 3,700		$ 3,700

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