Income Taxes (Schedule of Deferred Tax Asset (Liability)) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
NOLs and tax credit carry forwards	$ 98,631	$ 103,407
Compensation and benefit plans	22,562	27,835
Allowance for doubtful accounts	1,832	428
Fixed assets and intangible assets	42,550	37,893
Accrued interest expense	5,599	7,202
Other liabilities	16,682	27,276
Deferred tax asset	187,856	204,041
Valuation allowance	(96,199)	(59,584)
Net deferred tax asset	91,657	144,457
Prepaid liabilities	(538)	(530)
Fixed assets and intangible assets	(84,005)	(93,300)
Investments in partnerships	(77,619)	(105,062)
Other assets	(36,458)	(30,931)
Deferred tax liability	(198,620)	(229,823)
Total net deferred tax liability	$ (106,963)	$ (85,366)