Long-term Debt	3 Months Ended
Mar. 31, 2019
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt Credit facility. The Company's long-term debt consists of senior notes, a revolving corporate credit facility (the "Credit Facility") and the effects of issuance costs and discounts. The Credit Facility is maintained with a syndicate of financial institutions and has aggregate loan commitments of $1.5 billion. The Credit Facility has a maturity date of October 2023. As of March 31, 2019, the Company had no outstanding borrowings under the Credit Facility and was in compliance with its debt covenants. Senior notes. The Company's 7.50% senior notes with a debt principal balance of $450 million will mature in January 2020 and are classified as current in the consolidated balance sheet as of March 31, 2019.

Long-term Debt

3 Months Ended

Mar. 31, 2019

Credit facility. The Company's long-term debt consists of senior notes, a revolving corporate credit facility (the "Credit Facility") and the effects of issuance costs and discounts. The Credit Facility is maintained with a syndicate of financial institutions and has aggregate loan commitments of $1.5 billion. The Credit Facility has a maturity date of October 2023. As of March 31, 2019, the Company had no outstanding borrowings under the Credit Facility and was in compliance with its debt covenants.

Senior notes. The Company's 7.50% senior notes with a debt principal balance of $450 million will mature in January 2020 and are classified as current in the consolidated balance sheet as of March 31, 2019.