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Retirement Plans (Funded Status of Retirement Income Plan) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended
Apr. 05, 2013
Jun. 30, 2013
Retirement Income Plan [Member]
Jun. 30, 2012
Retirement Income Plan [Member]
Jun. 30, 2013
Retirement Income Plan [Member]
Jun. 30, 2012
Retirement Income Plan [Member]
Dec. 31, 2012
Retirement Income Plan [Member]
Jun. 30, 2013
Retirement Income Plan [Member]
Funded Status of Retirement Income Plan [Member]
Dec. 31, 2012
Retirement Income Plan [Member]
Funded Status of Retirement Income Plan [Member]
Enhanced company contribtion to the Retirement Savings Plan 4.00%              
Change In Benefit Obligation [Abstract]                
Benefit Obligation, beginning of year             $ 302,647 $ 254,009
Service cost   1,857 2,154 4,306 4,308   2,449 8,091
Interest cost   3,051 3,230 6,354 6,460   3,303 12,981
Actuarial (gain) losses             (11,485) 33,596
Benefits paid             (1,598) (6,030)
Impact of curtailment             (29,603) 0
Benefit Obligation, end of year             265,713 302,647
Change In Fair Value Of Assets Abstract                
Fair Value of assets, beggining fo year             207,150 182,614
Actual return on plan assets, net of expenses             6,760 21,896
Contributions by the employer to funded plans             2,650 8,550
Contributions by the employer to unfunded plans             30 120
Benefits paid fair value             (1,598) (6,030)
Fair value of assets, end of period             214,992 207,150
Funded Status             (50,721) (95,497)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]                
Liabilities   (50,721)   (50,721)   (95,497)    
Net pension liability, end of period   (50,721)   (50,721)   (95,497)    
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]                
Prior serrvice cost   0   0   26    
Net actuarial loss   57,543   57,543   103,365    
Total   57,543   57,543   103,391    
Accumulated benefit obligation   $ 257,412   $ 257,412   $ 265,899    
Weighted-Average Assumptions [Abstract]                
Discount Rate   4.66%   4.66%   4.42%    
Rate of Compensation Increase   4.00%   4.00%   4.00%