Leases Lease Terms Details (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense, Net	$ 2,833,000	$ 2,720,000	$ 2,620,000
Minimum [Member]
Operating Leased Assets [Line Items]
Term of Lease	one year
Renewal Term of Lease	one year
Maximum [Member]
Operating Leased Assets [Line Items]
Term of Lease	fifteen years
Renewal Term of Lease	five years