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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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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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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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Long-Term Debt Long-Term Debt - Notes (Details) - USD ($)				1 Months Ended	3 Months Ended								12 Months Ended
	Dec. 20, 2019	Apr. 05, 2019	Mar. 21, 2019	Apr. 30, 2014	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument
Borrowings of long-term debt													$ 2,395,250,000	$ 714,830,000	$ 1,242,000,000
Repayments of long-term debt													2,071,750,000	605,636,000	1,270,194,000
Interest paid, net of capitalized amounts													97,451,000	86,758,000	78,891,000
Debt extinguishment loss					$ 0	$ 0	$ 3,653,000	$ 0	$ 0	$ 0	$ 2,450,000	$ 0	3,653,000	2,450,000	$ 291,000
Senior Notes \| 2028 Notes
Debt Instrument
Principal amount	$ 500,000,000.0
Interest rate (as a percent)	6.25%
Borrowings of long-term debt	$ 491,800,000
Deferred finance cost	$ 8,200,000				8,090,000				0				8,090,000	0
Senior Notes \| 2027 Notes
Debt Instrument
Principal amount			$ 500,000,000.0
Interest rate (as a percent)			6.875%
Borrowings of long-term debt			$ 491,200,000
Deferred finance cost			$ 8,800,000		7,999,000				0				7,999,000	0
Senior Notes \| 2022 Notes
Debt Instrument
Principal amount				$ 350,000,000.0
Interest rate (as a percent)				6.00%
Deferred finance cost					2,316,000				3,133,000				2,316,000	3,133,000
Unamortized debt issuance cost				$ 5,700,000	2,046,000				2,766,000				2,046,000	2,766,000
Debt instrument effective interest rate (percentage)				6.25%
Senior Notes \| 2022 Notes \| Debt Instrument, Redemption, Period One
Debt Instrument
Redemption rate				101.50%
Senior Notes \| 2022 Notes \| Debt Instrument, Redemption, Period Two
Debt Instrument
Redemption rate				100.00%
Senior Notes \| 2021 Notes
Debt Instrument
Deferred finance cost					0				2,311,000				0	2,311,000
Unamortized debt issuance cost					$ 0				$ 1,789,000				0	$ 1,789,000
Redemption rate		100.00%
Repayments of long-term debt		$ 350,000,000.0
Interest paid, net of capitalized amounts		$ 200,000
Debt extinguishment loss													$ 3,700,000