Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Discontinued Operations [Member]
Components of net periodic benefit cost
Total net periodic benefit cost	$ 0	$ 0	$ 200,000
Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	4,800,000	4,200,000	5,200,000
Interest cost	17,200,000	17,700,000	16,200,000
Expected return on plan assets	(21,400,000)	(22,700,000)	(20,700,000)
Amortization of prior service cost	200,000	300,000	400,000
Amortization of net loss	9,500,000	6,600,000	9,200,000
Settlements or curtailments	400,000	400,000	1,500,000
Total net periodic benefit cost	10,700,000	6,500,000	11,800,000
Other Benefits [Member]
Components of net periodic benefit cost
Service cost	0	0	0
Interest cost	200,000	200,000	200,000
Expected return on plan assets	0	0	0
Amortization of prior service cost	(3,100,000)	(3,100,000)	(3,100,000)
Amortization of net loss	1,500,000	1,500,000	1,500,000
Settlements or curtailments	0	0	0
Total net periodic benefit cost	$ (1,400,000)	$ (1,400,000)	$ (1,400,000)