Stock-Based Compensation Plans Market Stock Units (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
MSU Expense	$ 500,000	$ 500,000	$ 300,000
Number of Market Stock Units
Outstanding on December 31, 2015	87,770
Granted	74,865
Exchanged for shares	(13,103)
Outstanding on December 31, 2016	149,532	87,770
Maximum Shares Potentially Issuable
Outstanding on December 31, 2015	131,655
Granted	112,299
Exchanged for shares	(19,656)
Outstanding on December 31, 2016	224,298	131,655
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential Shares From MSU Vest	$ 0
Trading days	30 days
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential Shares From MSU Vest	$ 1.50
Trading days	60 days