Real Estate Sales and Assets Held For Sale Assets Held for Sale (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Total assets held for sale	[1]	$ 38,900	$ 17,176
FCC licenses
Total assets held for sale		38,900	0
Wholly Owned Properties
Total assets held for sale		$ 0	$ 17,176

[1] (4)See Note 2 for information regarding discontinued operations and Note 6 for information regarding assets held for sale.