Long-Term Debt - Senior Unsecured Notes due 2025 (Details) - Senior Notes - 6.750% senior unsecured notes due 2025 - USD ($)	Jun. 30, 2017	Dec. 31, 2019
Debt Instrument [Line Items]
Debt instrument, stated rate	6.75%
Original balance of debt	$ 370,000,000.0
Debt issuance costs		$ 17,300,000
Redemption Period One
Debt Instrument [Line Items]
Amount of principal available to be redeemed, percentage	40.00%
Cash proceeds of principal amount, percentage	106.75%
Minimum principal remaining, percentage	50.00%
Period after equity offering	180 days
Redemption price, percentage	100.00%
Redemption Period Two
Debt Instrument [Line Items]
Redemption price, percentage	103.375%
Redemption Period Three
Debt Instrument [Line Items]
Redemption price, percentage	101.688%
Redemption Period Four
Debt Instrument [Line Items]
Redemption price, percentage	100.00%
Redemption Period Five
Debt Instrument [Line Items]
Redemption price, percentage	101.00%

Debt Instrument, Redemption Price, Minimum Percentage of Principal Remaining After Redemption

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Debt Instrument, Redemption Price, Period After Equity Offering

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

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

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

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Percentage of principal amount of debt redeemed.

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

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