Revenue - Summary of Deferred Revenue Activity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Change in Contract with Customer, Liability [Roll Forward]
Balance at beginning of period	$ 68,804
Add:
New prepay contracts entered into during the period	45,538
Less:
Revenue recognized that was included in the contract liability balance at the beginning of the period	67,824
Revenue recognized related to contracts entered into during the period	18,004
Other changes	673
Balance at end of period	27,841
Prepaid contracts where payment was collected	$ 26,800