Employee Benefit Plans (Defined Benefit Plans Disclosure) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,307	$ 2,195	$ 6,923	$ 6,185
Interest cost	1,262	1,367	3,788	3,662
Expected return on plan assets	(1,224)	(1,118)	(3,673)	(3,353)
Amortization of prior service cost	82	214	245	432
Amortization of prior actuarial loss	636	489	1,908	1,407
Total	3,063	3,147	9,191	8,333
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,868	826	3,046	1,766
Interest cost	947	794	1,929	1,471
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of prior actuarial loss	1,319	361	1,849	795
Total	$ 4,134	$ 1,981	$ 6,824	$ 4,032