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Debt (Debt Repurchases) (Details) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 12, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt		$ 0	$ (5,741,000)	$ 1,563,000	$ (5,741,000)
5.875% Senior Notes due 2024
Debt Instrument [Line Items]
Stated interest rate		5.875%		5.875%
5.125% Senior Notes due 2023
Debt Instrument [Line Items]
Stated interest rate		5.125%		5.125%
5.875% Senior Notes due 2022
Debt Instrument [Line Items]
Stated interest rate		5.875%		5.875%
Amended Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 100,000.0		$ 100,000.0
Gain (loss) on extinguishment of debt	$ (1,200,000)
6.00% Senior Notes due 2026
Debt Instrument [Line Items]
Stated interest rate		6.00%		6.00%
Senior Notes | 5.875% Senior Notes due 2024
Debt Instrument [Line Items]
Stated interest rate		5.875%		5.875%		5.875%
Senior Notes | 5.125% Senior Notes due 2023
Debt Instrument [Line Items]
Stated interest rate		5.125%		5.125%		5.125%
Debt instrument, repurchased face amount		$ 5,500,000		$ 5,500,000
Percentage of principal amount redeemed				70.68%
Repurchase amount		$ 3,900,000		$ 3,900,000
Gain (loss) on extinguishment of debt				$ 1,600,000
Senior Notes | 5.875% Senior Notes due 2022
Debt Instrument [Line Items]
Stated interest rate		5.875%		5.875%		5.875%
Debt instrument, repurchased face amount						$ 56,000,000.0
Percentage of principal amount redeemed						97.55%
Repurchase amount						$ 54,700,000
Gain (loss) on extinguishment of debt						$ 300,000
Senior Notes | 6.00% Senior Notes due 2026
Debt Instrument [Line Items]
Stated interest rate		6.00%		6.00%		6.00%

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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Topic 470
-SubTopic 50
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