Components of Working Capital - Accounts Receivable, Net Table (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Receivables [Abstract]
Trade receivables, net		$ 224,719	$ 160,194
Other receivables, net		168	45
Total accounts receivable, net	[1]	$ 224,887	$ 160,239

[1] Accounts receivable, net includes amounts receivable from affiliates (as defined in Note 1) of $59.1 million and $36.1 million as of September 30, 2018, and December 31, 2017, respectively.