Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jan. 01, 2017	Dec. 31, 2016
Fair value measurements
Amount of transfers between levels within the fair value hierarchy			$ 0	$ 0
Research and Development
Research and development expenses	$ 7,437,000	$ 7,562,000	15,142,000	14,494,000
Capitalized Software Costs
Expenditures for externally marketed software			(17,119,000)	(12,299,000)
Other noncurrent assets, net
Capitalized Software Costs
Net carrying amount of externally marketed software	84,800,000		84,800,000			$ 76,300,000
Externally marketed software under development and not yet placed in service	12,400,000		12,400,000			50,100,000
Expenditures for externally marketed software	(6,300,000)	(6,300,000)	(17,100,000)	(12,300,000)
Amortization expense relating to the development of externally marketed software	5,300,000	2,300,000	$ 8,600,000	4,600,000
Maximum
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	6,800,000	3,300,000	$ 13,700,000	6,100,000
Research and Development Expense
Research and Development
Research and development expenses	7,400,000	$ 7,600,000	15,100,000	$ 14,500,000
Level 2
Fair value measurements
Orbital incentive obligations	$ 115,600,000		$ 115,600,000			$ 74,100,000
Accumulated Earnings | Accounting Standards Update 2016-09
New Accounting Pronouncements
Cumulative effect of adoption of ASU 2016-09 as of January 1, 2017					$ 14,500,000
6 1/2% Senior Secured Notes due 2019
Fair value measurements
Interest rate	6.50%		6.50%			6.50%
7 5/8% Senior Unsecured Notes due 2021
Fair value measurements
Interest rate	7.625%		7.625%			7.625%
5 1/4% Senior Secured Notes due 2026
Fair value measurements
Interest rate	5.25%		5.25%			5.25%
6 5/8% Senior Unsecured Notes due 2026
Fair value measurements
Interest rate	6.625%		6.625%			6.625%