Stock-Based Compensation Plans (Details) - shares	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Stock options [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted	15,270	407,637
Performance Shares [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted	5,126	154,351
Restricted Stock Units [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted	37,365	435,865
Non-employee Stock Appreciation Rights [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted		26,494
Non-employee Agent Stock Options [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted		102,638
Non-employee Director Deferred Stock Units [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted	7,059	14,534