Employee Benefit Plans (Schedule of Net Funded Status) (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		$ 68,435	$ 66,757
Defined Benefit Plan, Benefit Obligation		142,239	138,196
Defined Benefit Plan, Funded Status of Plan, Total		(73,804)	(71,439)
Qualified Pension Plans Defined Benefit [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		68,435	66,757
Defined Benefit Plan, Benefit Obligation		83,870	80,104
Defined Benefit Plan, Funded Status of Plan, Total		(15,435)	(13,347)
Non Qualified Pension Plans Defined Benefit [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	0	0
Defined Benefit Plan, Benefit Obligation	[1]	58,369	58,092
Defined Benefit Plan, Funded Status of Plan, Total	[1]	$ (58,369)	$ (58,092)

[1] For non-qualified plans, there are no required funding levels.