Stock-Based Compensation Market Stock Units (Details) - shares	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Market Stock Units [Abstract]
MSU Outstanding Balance	247,775	149,532
Potential Shares from MSUs Outstanding	371,363	224,298
MSU Grants	98,243
Potential Shares from MSU Grants	147,065