Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Tax benefit at U.S. Statutory Rate of 35%	$ 2,800	$ 3,566	$ 2,811
State and local income taxes, net of federal income tax	(4,588)	7,821	4,497
Equity in net income of affiliates	(29,427)	36,677	526
Extraterritorial income exclusion			3,468
Provision for unrecognized tax benefits	(1,113)	(708)	(833)
interest on deferred installment sale			(216)
Nondeductible expenses	(586)	(1,411)	(1,359)
Change in valuation allowance	4,565	(307)	(624)
Foreign income taxes	(153)	(153)	(143)
Other, net	(5)	(9)	(22)
Income tax benefit (provision)	$ (28,507)	$ 45,476	$ 8,105
U.S. statutory rate	35.00%	35.00%	35.00%