Shareholders' Equity and Non-Controlling Interests (Noncontrolling Interest Balance Sheet Allocation) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Subsidiary-specific information [Line Items]
Current assets	$ 162,897	$ 55,335
Non-current assets	437,367	636,342
Current liabilities	(138,393)	(57,153)
Non-current liabilities	(186,825)	(139,730)
Non-controlling interests	27,743	88,787
HSCP
Subsidiary-specific information [Line Items]
Current assets	159,764	55,296
Non-current assets	435,581	584,812
Current liabilities	(123,838)	(46,434)
Non-current liabilities	(146,437)	(75,219)
Other NCI balances	(547)	(1,041)
Accumulated equity-settled expenses	(179,476)	(111,934)
Net assets	145,047	405,480
Net assets allocated to USCo2/HSCP	27,196	87,746
Net assets attributable to other NCIs	$ 547	$ 1,041
HSCP | HSCP/USCo2
Subsidiary-specific information [Line Items]
HSCP/USCo2 ownership % of HSCP	18.75%	21.64%