Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of Assets, Liabilities, and Equity Measured at Fair Value on a Recurring Basis

A summary of assets and (liabilities) at September 30, 2018 and December 31, 2017, related to the Company's financial instruments, measured at fair value on a recurring basis, is set forth below:

			Fair Value
Financial Instrument	Balance sheet location		September 30, 2018			December 31, 2017
Money market funds	Cash and cash equivalents	Level 1	$	440,216		$	177,235
Forward sales commitments	Other current assets	Level 2	71			9
Forward sales commitments	Accrued liabilities	Level 2	(6		)	(2		)
Interest rate lock commitments	Other current assets	Level 3	120			29
Interest rate lock commitments	Accrued liabilities	Level 3	(25		)	(4		)