Shareholders' Equity - Narrative (Details) - USD ($)			1 Months Ended	6 Months Ended
	Mar. 10, 2020	Mar. 13, 2019	Feb. 29, 2020	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020
Class of Stock [Line Items]
Repurchase of shares				$ 20,869,000
Common stock, cash dividends paid			$ 2,900,000
Common Shares
Class of Stock [Line Items]
Surrender of shares for tax withholding (in shares)				183,466	168,327
Share Repurchase Program, March 13, 2019
Class of Stock [Line Items]
Stock repurchase program, period in force		12 months
Repurchase of shares				$ 20,800,000
Share Repurchase Program, March 13, 2019 | Common Shares
Class of Stock [Line Items]
Stock repurchase program, authorized amount (up to)		$ 150,000,000.0
Stock repurchase program, amount expired						$ 129,200,000
Repurchase of shares (in shares)				711,000
Average cost per share (in dollars per share)				$ 29.31
Share Repurchase Program, March 10, 2020
Class of Stock [Line Items]
Stock repurchase program, period in force	12 months
Share Repurchase Program, March 10, 2020 | Common Shares
Class of Stock [Line Items]
Stock repurchase program, authorized amount (up to)	$ 150,000,000.0