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Commitments and Contingencies - Lease Commitments (Details) ft² in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jan. 31, 2018 USD ($) ft²
Property, Plant and Equipment [Line Items]
Operating lease rent expense	$ 4,700,000	$ 3,900,000	$ 3,700,000
Capital leased assets	37,274,000	38,350,000
COLORADO | Subsequent event
Property, Plant and Equipment [Line Items]
New lease agreement, area of property (in square feet) | ft²				30
Aggregate annual payment under new lease				$ 1,000,000.0
Computer Equipment and Furniture
Property, Plant and Equipment [Line Items]
Capital leased assets	$ 0	$ 0	$ 500,000

X

- Definition

Area of a real estate property.

+ References

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X

- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

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- References

No definition available.

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