Stock-Based Awards - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense	$ 4,793,000	$ 3,335,000	$ 11,813,000	$ 8,013,000
Performance Share Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted associated with PSU bonus program for senior executives and other bonus eligible employees			234,000
Stock based compensation expense	$ 600,000		$ 1,200,000
Performance Share Units | Vest at 100% Ahievement
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares expected to vest upon achievement			134,000
Number of shares expected to vest, achievement percentage			100.00%
Performance Share Units | Vest at 175% Achievement
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares expected to vest upon achievement			234,000
Number of shares expected to vest, achievement percentage			175.00%