Summary of Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Foreign Currency
Foreign currency transaction gain (loss)	$ 1,200,000	$ (500,000)	$ (4,300,000)
Fair value measurements
Amount of transfers between levels within the fair value hierarchy	0	0
Research and Development
Research and development expenses	31,745,000	31,170,000	26,377,000
Capitalized Software Costs
Expenditures for externally marketed software	(31,331,000)	(23,252,000)	(22,327,000)
Other noncurrent assets, net
Capitalized Software Costs
Net carrying amount of externally marketed software	88,100,000	76,300,000
Externally marketed software under development and not yet placed in service	19,600,000	50,100,000
Expenditures for externally marketed software	(31,300,000)	(23,300,000)	(22,300,000)
Amortization expense relating to the development of externally marketed software	$ 19,500,000	9,700,000	8,400,000
Minimum
Property, Plant and Equipment [Abstract]
Useful life	1 year
Finite-Lived Intangible Assets, Net [Abstract]
Useful life	1 year
Maximum
Property, Plant and Equipment [Abstract]
Useful life	40 years
Finite-Lived Intangible Assets, Net [Abstract]
Useful life	30 years
Capitalized Software Costs
Software useful life	5 years
Weighted-average
Capitalized Software Costs
Software useful life	4 years
Cost of sales
Research and Development
Research and development expenses	$ 27,900,000	23,700,000	19,600,000
Research and development expenses
Research and Development
Research and development expenses	31,700,000	31,200,000	26,400,000
Selling, general and administrative expenses
Advertising Costs
Advertising expenses	64,200,000	43,900,000	$ 44,300,000
Level 2
Fair value measurements
In-orbit incentive obligations	$ 112,200,000	$ 74,100,000
6 1/2% Senior Secured Notes due 2019
Fair value measurements
Interest rate		6.50%
6 1/2% Senior Secured Notes due 2019 | Senior Secured Notes:
Fair value measurements
Interest rate	6.50%
5 1/4% Senior Secured Notes due 2026
Fair value measurements
Interest rate		5.25%
5 1/4% Senior Secured Notes due 2026 | Senior Secured Notes:
Fair value measurements
Interest rate	5.25%
7 5/8% Senior Unsecured Notes due 2021 | Senior Unsecured Notes:
Fair value measurements
Interest rate	7.625%
6 5/8% Senior Unsecured Notes due 2026
Fair value measurements
Interest rate		6.625%
6 5/8% Senior Unsecured Notes due 2026 | Senior Unsecured Notes:
Fair value measurements
Interest rate	6.625%