Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Accounting Policies [Abstract]
Unsatisfied performance obligation	$ 54,200		$ 54,200
Allowance for doubtful accounts	3,236		3,236		$ 3,346
Unearned revenue	9,371		9,371		$ 10,704
Prior year unearned revenue recognized in period			9,200
Share-based compensation costs	$ 3,000	$ 2,800	$ 7,200	$ 8,500
Antidilutive securities excluded from computation of Earnings Per Share, amount			2.3