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Commitments and Contingencies - Build to Suit (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) phase	Dec. 31, 2016 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2013 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Financing obligation number of phases | phase	2
Financing obligation, lessor committed fundings phase 1	$ 11,800
Financing obligation, lessor committed fundings phase 2	11,100
Debt Instrument [Line Items]
Capital leased assets	37,274	$ 38,350
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 56,079	55,619
Financing obligation, purchase option period	3 years
Buildings
Debt Instrument [Line Items]
Capital leased assets	$ 36,608	36,603
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 36,608	$ 36,603	$ 19,900	$ 17,100
Financing Lease Obligation
Debt Instrument [Line Items]
Capital leased assets			$ 11,100	$ 11,800

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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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-Name Accounting Standards Codification
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