Employee Benefit Plans (Pension Costs) (Details) - Pension Plan SERP and Restoration Plan [Member] - USD ($) $ in Thousands	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]
Service costs	$ 90	$ 161	$ 282
Interest costs	2,587	1,205	1,231
Expected return on plan assets	(160)	0	0
Amortization of net loss/(gain)	979	(620)	(424)
Net periodic benefit cost	$ 3,496	$ 746	$ 1,089