Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Jun. 20, 2017	Aug. 31, 2013	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Long-term Purchase Commitment [Line Items]
Lease term		120 months
Letter of credit outstanding, amount			$ 4,000
Recorded assets			165,367	$ 143,299
Financing lease obligation			37,743	39,600
Lease financing obligation, current			2,312
Lease financing obligations, non-current			35,431	37,673
Non-cancelable purchase commitments			389,200
Civil penalty	$ 307,000
Other Assets
Long-term Purchase Commitment [Line Items]
Restricted deposits			17,400	36,900
Contract with manufacturers and suppliers
Long-term Purchase Commitment [Line Items]
Non-cancelable purchase commitments			346,000
Building and improvements
Long-term Purchase Commitment [Line Items]
Recorded assets			53,400	53,400
Land
Long-term Purchase Commitment [Line Items]
Lease expense under financing obligation			$ 1,300	$ 1,300	$ 1,300