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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

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