Basis of Presentation (Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Money Market Funds [Member] | Level 1 [Member]
Assets, Fair Value
Cash equivalents	$ 254,552	$ 251,742
Sale of SSL, Nov. 02, 2012 [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets, Fair Value
Indemnification - sale of SSL	2,410	2,410
Globalstar do Brasil S.A. [Member] | Level 3 [Member]
Liabilities, Fair Value
Indemnification - Globalstar do Brasil S.A.	$ 184	$ 293