Subsequent Events (Details) - USD ($)	Apr. 30, 2018	Apr. 25, 2018	Apr. 01, 2018
Subsequent Event [Line Items]
Authorized common stock to be repurchased			$ 200,000,000
Subsequent Event
Subsequent Event [Line Items]
Authorized common stock to be repurchased		$ 300,000,000
Dividends (in dollars per share)	$ 0.045
Dividends payable, date payable	Jun. 01, 2018
Dividends payable, date of record	May 18, 2018
General Stock Option Plan | Subsequent Event
Subsequent Event [Line Items]
Authorized common stock to be repurchased		$ 10,000,000