Employee Benefit Plans Summary of Pension Plan and Postretirement Plan Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
		Feb. 01, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Plan [Member]
Define Benefit Plan Disclosure [Line Items]
Service cost	[1]		$ 145	$ 92	$ 290	$ 184
Interest cost			851	853	1,702	1,706
Expected return on plan assets			(752)	(810)	(1,504)	(1,621)
Net amortization and deferral			782	244	1,564	488
Net periodic benefit cost			1,026	379	2,052	757
Postretirement Plan [Member]
Define Benefit Plan Disclosure [Line Items]
Service cost	[2]		0	0	0	15
Interest cost			52	48	104	109
Net accretion and deferral			(65)	(84)	(130)	(179)
Net periodic benefit cost			(13)	$ (36)	$ (26)	$ (55)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments		$ 1,500
Defined Benefit Plan, Curtailments			$ 3,400

[1] The Pension Plan service cost recorded for the six months ended June 30, 2015 and 2014 was related to administrative costs associated with the plan and was not due to the accrual of additional participant benefits.

[2] As a result of the plan amendment, additional participant benefits are not accrued under the Postretirement Plan after February 1, 2014.