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Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets related to non-vested stock awards	$ 0
Interest expense related to uncertain tax positions	1,853,000	$ 536,000	$ 364,000
Interest on Income Taxes Accrued	3,054,000	1,329,000
Lapsing of statutes of limitations	$ 209,000	$ 328,000	$ 0
Statutory U.S. federal income tax rate	21.00%	21.00%	35.00%
Income tax expense/(benefit) from tax rate change		$ 6,446,000
One-time transition tax			$ 0
Foreign Tax Authority [Member]
Gross NOLS	$ 68,169,000	54,599,000
Valuation allowances of deferred tax assets	77,191,000	$ 63,509,000
Domestic Tax Authority [Member]
Lapsing of statutes of limitations	$ 202,000

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Tax Cuts And Jobs Act, one-time transition tax.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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