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Financial Instruments - Credit Risk Narrative (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Maximum exposure to credit risk	$ 1,424,786,000	$ 1,586,978,000
Accounts receivable, threshold period past due, writeoff	120 days
Current expected credit loss	$ 80,000	136,000
Cash and cash equivalents	1,109,700,000	1,199,693,000
Short-term investments	213,614,000	306,347,000
Advances to joint ventures, allowance for credit loss	$ 0	$ 0
Four Customers | Accounts Receivable | Credit Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	78.00%
Two Customers | Accounts Receivable | Credit Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage		56.00%

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Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

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