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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company has an operating lease agreement with an entity controlled by the Company’s CEO to lease an aircraft for business purposes. The Company paid $2.0 million in lease payments to the entity for its use of the aircraft during each of the years ended December 31, 2018, 2017 and 2016. No amounts were payable to this related party as of December 31, 2018 and 2017. The Company determined the lease payments were at fair market lease rates. In June 2016, the Company purchased parcels of land from an entity controlled by the Company's CEO, to be utilized to expand the Company’s corporate headquarters to accommodate its growth needs. The purchase price for these parcels totaled $70.3 million. The Company determined that the purchase price for the land represented the fair market value of the parcels and approximated the cost to the seller to purchase and develop the parcels, including costs related to the termination of a lease encumbering the parcels. In connection with the purchase of these parcels, in September 2016, the parties entered into an agreement pursuant to which the parties will share the burden of any special taxes arising due to infrastructure projects in the surrounding area. The allocation to the Company is based on the expected benefits to the Company’s parcels from these projects. No obligations were owed by either party under this agreement as of December 31, 2018.