Employee Benefit Plans (Net Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		$ 14,241
Interest cost		23,711
Total change in pension obligation, net of tax	17,195	11,236	7,071
Defined Benefit Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	16,332	14,241	13,265
Interest cost	23,686	23,711	23,810
Expected return on assets	(27,733)	(28,478)	(29,184)
Amortization of prior service cost	(210)	(210)	(210)
Amortization of net actuarial loss	16,985	11,026	6,861
Total pension expense	29,480	20,710	14,962
Current year actuarial gain (loss)	123,557	(44,315)	(58,630)
Total change in pension obligation, net of tax	(140,752)	33,079	51,559
Total recognized in net periodic benefit cost and other comprehensive income	$ (111,272)	$ 53,789	$ 66,521