Components of Working Capital - Accounts Receivable, Net Table (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Trade receivables, net		$ 160,194	$ 192,606
Other receivables, net		45	30,415
Total accounts receivable, net	[1]	$ 160,239	$ 223,021

[1] Accounts receivable, net includes amounts receivable from affiliates (as defined in Note 1) of $36.1 million and $76.4 million as of December 31, 2017 and 2016, respectively. Accounts receivable, net as of December 31, 2016, also includes an insurance claim receivable related to an incident at the DBM complex. See Note 1.