Pension Plans (Expected Future Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Qualified Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
2016	$ 32,020
2017	33,787
2018	35,339
2019	37,057
2020	38,651
2021-2025	$ 212,608
Discount rate for calculating benefit obligations	4.17%	3.80%
Discount rate for calculating net periodic benefit cost	3.80%	4.60%
Expected return on plan assets	7.50%	7.50%
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
2016	$ 530
2017	2,972
2018	509
2019	496
2020	482
2021-2025	$ 4,321
Discount rate for calculating benefit obligations	3.47%	3.15%
Discount rate for calculating net periodic benefit cost	3.15%	3.60%