Quarterly report pursuant to Section 13 or 15(d)

Benefit Plans (Details)

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Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Change in Fair Value of Plan Assets [Abstract]        
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance     $ 653,013  
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance $ 630,535   630,535  
Pension Benefits [Member]        
Components of net periodic benefit expense [Abstract]        
Service cost 458 $ 435 915 $ 870
Interest cost 7,984 8,100 15,969 16,200
Expected return on plan assets (11,044) (11,446) (22,087) (22,892)
Amortization of prior service cost 0 0 0 0
Amortization of gains (losses) 1,984 1,442 3,966 2,884
Settlements 3,100 2,500 5,650 5,000
Benefit cost 2,482 1,031 4,413 2,062
Change in Benefit Obligation [Roll Forward]        
Service cost 458 435 915 870
Interest cost 7,984 8,100 15,969 16,200
Post Retirement Benefits [Member]        
Components of net periodic benefit expense [Abstract]        
Service cost 0 0 0 0
Interest cost 142 259 283 518
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (492) (339) (984) (678)
Amortization of gains (losses) (116) (144) (232) (288)
Settlements 0 0 0 0
Benefit cost (466) (224) (933) (448)
Change in Benefit Obligation [Roll Forward]        
Service cost 0 0 0 0
Interest cost $ 142 $ 259 $ 283 $ 518