Shareholders' Equity (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Nov. 13, 2014
Equity, Class of Treasury Stock [Line Items]
Cash dividends declared per share (in dollars per share)	$ 0.19	$ 0.19	$ 0.57	$ 0.57
Repurchase of shares (in shares)	113,656	0	113,656	0
Treasury Stock, Value, Acquired, Cost Method	$ 5,400,000		$ 5,400,000
Remaining authorized repurchase capacity	$ 155,300,000		$ 155,300,000
Share repurchase program 2014
Equity, Class of Treasury Stock [Line Items]
Authorized amount to be repurchased					$ 500,000,000.0