Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Loss and capital carryforwards	$ 168,450	$ 150,011
Deferred revenue	20,026	23,716
Accrued stock compensation	3,889	3,598
Debt	6,448	13,948
Operating lease liability	33,656
Other accrued liabilities	9,578	0
Other future deductible amounts	35,489	39,298
Deferred tax assets	277,536	230,571
Valuation allowance	(1,366)	(1,326)
Net deferred tax assets	276,170	229,245
Deferred tax liabilities
Investments	1,439,140	573,016
Fixed assets	209,094	232,899
Intangible assets	171,950	215,394
Operating lease ROU assets	34,629
Deferred tax liabilities	1,854,813	1,021,309
Net deferred tax liabilities	$ 1,578,643	$ 792,064