Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Fair value measurements
Amount of transfers between levels within the fair value hierarchy			$ 0	$ 0
Research and Development
Research and development expenses	$ 20,587,000	$ 19,875,000	61,761,000	57,432,000
Other noncurrent assets, net
Capitalized Software Costs
Net carrying amount of externally marketed software	73,600,000		73,600,000		$ 62,800,000
Capitalized cost for software not yet placed in service	45,600,000		45,600,000		32,600,000
Capitalized costs related to development of externally marketed software	6,200,000	5,300,000	18,500,000	17,000,000
Amortization expense relating to the externally marketed software	2,500,000	2,200,000	$ 7,200,000	6,100,000
ASU 2015-03 | Other noncurrent assets, net
New Accounting Pronouncements
Unamortized debt issuance costs					(31,300,000)
ASU 2015-03 | Long-term debt and capital lease obligations, net of unamortized debt issuance costs
New Accounting Pronouncements
Unamortized debt issuance costs					31,300,000
Maximum
Capitalized Software Costs
Software useful life			5 years
Weighted Average
Capitalized Software Costs
Software useful life			3 years
Cost of Sales
Research and Development
Research and development expenses	22,600,000	15,200,000	$ 48,900,000	45,700,000
Research and Development Expense
Research and Development
Research and development expenses	20,600,000	$ 19,900,000	61,800,000	$ 57,400,000
Level 2
Fair value measurements
Orbital incentive obligations	$ 75,200,000		$ 75,200,000		$ 79,300,000