Segment Information (Details 5) - Customer Concentration Risk - Sales - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Charter and affiliates
Revenue, Major Customer [Line Items]
Customers and affiliates	$ 928,403	$ 985,237	$ 1,064,408	[1]
Concentration Risk, Percentage	13.80%	14.90%	15.60%
Comcast and affiliates
Revenue, Major Customer [Line Items]
Customers and affiliates	$ 1,114,238	$ 1,479,415	$ 1,637,519	[1]
Concentration Risk, Percentage	16.50%	22.40%	24.00%

[1] Revenues were reduced $30.2 million in 2016, as a result of warrants held by Charter and Comcast. (see Note 18 Warrants for additional information).