Share Repurchase Plan - Summary of Share Repurchase Activity (Details) - USD ($)	3 Months Ended		5 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Jul. 31, 2019	May 31, 2016
Equity [Abstract]
Total number of shares repurchased	536,743	0	1,263,642	958,459	0
Average price paid per share	$ 34.83			$ 33.73
Total value of shares repurchased	$ 18,700,000			$ 32,300,000
Total authorized repurchase amount	80,000,000.0		$ 80,000,000.0	80,000,000.0		$ 50,000,000.0	$ 30,000,000.0
Total value of shares repurchased	39,800,000		39,800,000	39,800,000
Total remaining authorized repurchase amount	$ 40,200,000		$ 40,200,000	$ 40,200,000