Revenue from Contracts with Customers - Narrative (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)		Dec. 31, 2017 USD ($)	[1]
Disaggregation of Revenue [Line Items]
Number of geographic segments | segment									2
Number of revenue streams | segment									3
Total revenue from contracts with customers	$ 757,000	$ 750,300	$ 680,400	$ 629,400	$ 476,100	$ 475,500	$ 443,000	$ 411,900	$ 2,817,111	$ 1,806,473	[1]	$ 1,300,464
Receivables from contracts with customers	186,800				$ 147,600				186,800	$ 147,600
Malaysia
Disaggregation of Revenue [Line Items]
Gain (loss) on disposition of business	$ 985,400								$ 985,400

[1] ¹ Reclassified to conform with current presentation (see Notes C and E). 2017 revenue is presented net of $58.9 million of transportation, gathering and processing costs as historically shown prior to the adoption of ASC 606 on January 1, 2018. See Notes to Consolidated Financial Statements, page 58.