Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Operating Lease, Payments	[1],[2],[3]	$ 105,933	$ 0	$ 0
Supplemental disclosure of cash flow information:
Interest paid		38,490	38,490	38,490
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	[2],[3]	$ 101,884	$ 0	$ 0

[1] Excludes the Company's contingent payments pursuant to operating leases, which are recorded as expense in the period such contingencies are resolved.

[2] Inclusive of leases with related parties. See note 7.

[3] See "Recently Adopted Accounting Pronouncements" in note 3 for a discussion of the recently adopted lease standard.