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Employee Benefit Plans Summary of Pension Plan and Postretirement Plan Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Feb. 01, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Pension Plan [Member]          
Define Benefit Plan Disclosure [Line Items]          
Service cost [1]   $ 145 $ 92 $ 435 $ 276
Interest cost   851 853 2,553 2,559
Expected return on plan assets   (752) (811) (2,256) (2,432)
Net amortization and deferral   782 244 2,346 732
Net periodic benefit cost   1,026 378 3,078 1,135
Postretirement Plan [Member]          
Define Benefit Plan Disclosure [Line Items]          
Service cost [2]   0 0 0 15
Interest cost   52 48 156 157
Net accretion and deferral   (65) (84) (195) (263)
Net periodic benefit cost   (13) $ (36) $ (39) $ (91)
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 nine months ended September 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.