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Long-Term Investments (Investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Long-term Investments [Abstract]      
Equity securities at fair value that qualify for the NAV practical expedient $ 71,019   $ 0
Investments accounted at cost 0   65,450
Equity-method investments 16,589   15,841
Long-term investments $ 87,608   81,291
Impact of adoption of new accounting standard, increase to beginning retained earnings   $ (12,857) 8,838
Equity securities without readily determinable fair value, not qualified for NAV     $ 5,000