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Long-Term Debt - 6.750% Senior Unsecured Notes due 2025 (Details) - Senior Notes - 6.750% senior unsecured notes due 2025 - USD ($)	Jun. 30, 2017	Dec. 31, 2020
Debt Instrument [Line Items]
Debt instrument, stated rate	6.75%	6.75%
Original balance of debt	$ 370,000,000.0
Redemption Period One
Debt Instrument [Line Items]
Redemption price, percentage	103.375%
Redemption Period Two
Debt Instrument [Line Items]
Redemption price, percentage	101.688%
Redemption Period Three
Debt Instrument [Line Items]
Redemption price, percentage	100.00%
Redemption Period Four
Debt Instrument [Line Items]
Redemption price, percentage	101.00%

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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X

- Definition

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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+ References

No definition available.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
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