Employee Benefit Plans (Projected Benefit Obligation) (Details) - SERP And Restoration Plans [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014
Change in projected benefit obligation:
Benefit obligation at beginning of period	$ 32,259		$ 27,059
Service costs	161		282
Interest costs	1,205		1,233
Actuarial (gains)/losses	(1,797)		5,564
Benefits paid	(1,880)		(1,879)
Projected benefit obligation at end of period	61,256		32,259
Change in plan assets:
Plan assets at fair value at beginning of period	0		0
Benefits paid	(1,880)		(1,879)
Plan assets at fair value at beginning of period	21,175		0
Unfunded status of the plans	(40,081)		(32,259)
Accrued benefit liability	(61,256)		(32,259)
Pension plan asset	21,175		0
Amounts recognized in accumulated other comprehensive income/(loss):
Unrecognized net actuarial loss	11,363	[1]	13,685
Unrecognized prior service credit	(5,631)		(6,775)
Pension and other postretirement benefit plans, amount recognized in accumulated other comprehensive income	5,732		6,910
Change in Plan Assets [Member]
Change in projected benefit obligation:
Addition of RELS	21,175		0
Benefits paid	(1,880)		(1,879)
Change in plan assets:
Addition of RELS	21,175		0
Company contributions	1,880		1,879
Benefits paid	(1,880)		(1,879)
Projected Benefit Obligation [Member]
Change in projected benefit obligation:
Addition of RELS	31,308		0
Change in plan assets:
Addition of RELS	$ 31,308		$ 0

[1] The risk-free interest rate for the periods within the contractual term of the PBRSUs is based on the U.S. Treasury yield curve in effect at the time of the grant.