Employee Benefit Plans (Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ 19,348	$ 16,542	$ 10,874
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	11,182	9,370	7,548
Interest cost	8,511	7,971	7,702
Expected return on plan assets	(8,495)	(7,743)	(9,067)
Amortization of actuarial loss from earlier periods	8,101	6,896	3,367
Amortization of unrecognized prior service cost	49	49	49
Settlement/Net loss recognition			1,275
Net periodic benefit cost	19,348	16,542	10,874
Other comprehensive income (loss) attributable to change from prior year	(32,552)	7,017
Total recognized in net periodic benefit cost and other comprehensive income (loss)	(13,204)	23,559
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,899	1,677	1,165
Interest cost	1,164	1,033	934
Settlement/Net loss recognition	739	432	159
Net periodic benefit cost	3,801	3,142	2,258
Other comprehensive income (loss) attributable to change from prior year	(3,779)	3,715
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$ 22	$ 6,857