Shareholders' Equity, Stock Plans and Preferred Stock - Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividends	2.70%
Weighted average expected term (years)	6 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility (range)		47.00%
Risk free interest rate (range)		2.68%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility (range)		49.00%
Risk free interest rate (range)		2.75%