Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 53,931
U.S. federal corporate tax rate	21.00%	21.00%	35.00%
Transition tax on foreign earnings			$ 98
Deferred tax assets valuation allowance	$ 61,945
Income before income taxes	116,592	$ 21,303	$ 20,445
Accrued expenses and other liabilities	$ 130,714	$ 108,662
Uncertain tax positions, description	The Company had accrued interest and penalties relating to uncertain tax positions of $754 and $3,967 for UOL and magicJack, respectively, for the year ended December 31, 2019 all of which was included in income taxes payable. The Company recorded a benefit of $73 and $174 for UOL and magicJack, respectively, related to interest and penalties for uncertain tax positions primarily due to the lapse in statute of limitation and resolution of magicJack's 2015 IRS audit in favor of the Company
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2024
Income before income taxes	$ 9,519
Federal Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Income before income taxes	$ 107,073
Federal Tax Authority [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2037
Federal Tax Authority [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2031
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 64,088
Decrease in unrecognized tax benefits is reasonably possible	$ 10,156