Domestic And Foreign Income Taxes (Schedule Of Reconciliation Of The Statutory Federal Income Tax Rate To The Effective Tax Rate Based On Income (Loss)) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Domestic And Foreign Income Taxes [Abstract]
Tax provision at statutory rate	34.00%	34.00%	34.00%
Change in valuation allowance	(46.42%)	(20.08%)	(10.74%)
Impact of permanent items, including stock based compensation expense	(7.93%)	(21.33%)	15.58%
Effect of foreign tax rates	2.49%	7.82%	(17.14%)
State taxes net of federal benefit	5.05%	1.92%	(3.67%)
Effect of dividend of foreign subsidiary in prior year	(3.85%)	5.18%	3.74%
Prior year provision to return true-up	10.60%	(6.70%)	(9.75%)
Non-controlling interest	(1.77%)	1.22%
Other	(0.03%)	(1.40%)	(6.08%)
Domestic and foreign income tax rate	(7.86%)	0.63%	5.94%