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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Fair Value Measurements - Nonrecurring Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Dec. 20, 2016	Oct. 28, 2016
Senior Unsecured Notes due 2024 [Member]
Fair value of assets and liabilities measured on a recurring and nonrecurring basis
Debt Instrument, Interest Rate, Stated Percentage	4.75%	4.75%		4.75%
Senior Unsecured Notes due 2025 [Member]
Fair value of assets and liabilities measured on a recurring and nonrecurring basis
Debt Instrument, Interest Rate, Stated Percentage	5.375%	5.375%	5.375%
Reported Value Measurement [Member] \| Company Credit Facility [Member] \| Nonrecurring [Member]
Fair value of assets and liabilities measured on a recurring and nonrecurring basis
Revolving credit facility	$ 0	$ 397,000
Reported Value Measurement [Member] \| Senior Unsecured Notes due 2024 [Member] \| Nonrecurring [Member]
Fair value of assets and liabilities measured on a recurring and nonrecurring basis
Senior Notes	1,250,000	500,000
Reported Value Measurement [Member] \| Senior Unsecured Notes due 2025 [Member] \| Nonrecurring [Member]
Fair value of assets and liabilities measured on a recurring and nonrecurring basis
Senior Notes	800,000	500,000
Reported Value Measurement [Member] \| Partnership Credit Facility [Member] \| Nonrecurring [Member]
Fair value of assets and liabilities measured on a recurring and nonrecurring basis
Revolving credit facility	296,500	93,500
Fair Value, Inputs, Level 1 [Member] \| Estimate of Fair Value Measurement [Member] \| Senior Unsecured Notes due 2024 [Member] \| Nonrecurring [Member]
Fair value of assets and liabilities measured on a recurring and nonrecurring basis
Senior Notes	1,252,613	501,855
Fair Value, Inputs, Level 1 [Member] \| Estimate of Fair Value Measurement [Member] \| Senior Unsecured Notes due 2025 [Member] \| Nonrecurring [Member]
Fair value of assets and liabilities measured on a recurring and nonrecurring basis
Senior Notes	819,000	515,000
Fair Value, Inputs, Level 2 [Member] \| Estimate of Fair Value Measurement [Member] \| Company Credit Facility [Member] \| Nonrecurring [Member]
Fair value of assets and liabilities measured on a recurring and nonrecurring basis
Revolving credit facility	0	397,000
Fair Value, Inputs, Level 2 [Member] \| Estimate of Fair Value Measurement [Member] \| Partnership Credit Facility [Member] \| Nonrecurring [Member]
Fair value of assets and liabilities measured on a recurring and nonrecurring basis
Revolving credit facility	$ 296,500	$ 93,500