Income Taxes (Schedule of Deferred Tax Asset (Liability)) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
NOLs and tax credit carry forwards	$ 103,407	$ 123,487
Compensation and benefit plans	27,835	29,294
Allowance for doubtful accounts	428	981
Fixed assets and intangible assets	37,893	24,150
Accrued interest expense	7,202	8,832
Other liabilities	27,276	24,594
Deferred tax asset	204,041	211,338
Valuation allowance	(59,584)	(95,185)
Net deferred tax asset	144,457	116,153
Prepaid liabilities	(530)	(514)
Fixed assets and intangible assets	(93,300)	(90,960)
Investments in partnerships	(105,062)	(121,156)
Other assets	(30,931)	(29,694)
Deferred tax liability	(229,823)	(242,324)
Total net deferred tax liability	$ (85,366)	$ (126,171)