Employee Benefit Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, discretionary contribution by employer	$ 0	$ 0	$ 0
Minimum required contribution for 2017	0
Contributions to the CERP	21,000	20,000	69,000
Recognized Net Loss Due to Settlements	0	0	1,687,000
Accumulated benefit obligation	116,700,000	117,600,000
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year	2,200,000
Interest cost on projected benefit obligation	$ 3,944,000	$ 4,762,000	$ 5,069,000
Expected long-term rate of return on pension plan assets	6.00%	6.00%	6.00%
Annualized 10-year return for pension plan	6.00%
Rate of return	7.20%	0.60%
Pension expense	$ 987,000
Expected pension expense for the upcoming fiscal year	$ 851,000
Equity securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term investment target mix	35.00%
Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term investment target mix	65.00%
Change due to updated mortality projection scale [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in pension plan obligations due to change in mortality assumptions	$ 1,500,000	$ 1,800,000
Change in Accounting Estimate, Type [Domain]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost on projected benefit obligation	$ (900,000)