Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Receivables [Abstract]
Total trade accounts receivable	$ 153,696		$ 153,696			$ 167,149
Contract assets	42,553		42,553			34,615
Allowance for doubtful accounts	(9,287)		(9,287)			(12,027)
Total trade accounts receivable and contract assets, net	186,962		186,962			189,737	$ 196,840
Trade accounts receivable - DISH Network, net	26,126		26,126			43,295	43,295
Allowance for Loan and Lease Loss, Recovery of Bad Debts	2,300	$ 3,200	6,800	$ 5,700
Contract with Customer, Asset and Liability [Abstract]
Contract liabilities	72,776		72,776			64,417	$ 65,959
Contract with Customer, Liability, Noncurrent	10,187		10,187			13,036
Contract with Customer, Liability	82,963		82,963			77,453
Change in Contract with Customer, Asset and Liability [Abstract]
Contract with Customer, Liability, Revenue Recognized			52,500
Revenue, Performance Obligation [Abstract]
Revenue, Remaining Performance Obligation	1,260,000		1,260,000
Trade accounts receivable
Receivables [Abstract]
Total trade accounts receivable	145,475		145,475			156,794
Trade accounts receivable - DISH Network, net	25,449		25,449			16,118
Lease Receivable
Receivables [Abstract]
Total trade accounts receivable	8,221		8,221			10,355
Trade accounts receivable - DISH Network, net	$ 677		$ 677			$ 27,177
Scenario, Forecast [Member]
Revenue, Performance Obligation [Abstract]
Revenue, Remaining Performance Obligation, Recognition In Period, Percentage					18.80%