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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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Fair Value Measurements - Textuals (Details) - USD ($)	3 Months Ended
Fair Value Measurements - Textuals (Details) - USD ($)	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gains or losses related to non-financial assets and liabilities	$ 0	$ 0
Senior Notes [Member] \| 5.125% Senior Notes Due 2023 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate (percent)	5.125%		5.125%
Senior Notes [Member] \| 5.75% Senior Notes Due 2024 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate (percent)	5.75%		5.75%
Senior Notes [Member] \| 5.75% Senior Notes Due 2025 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate (percent)	5.75%		5.75%