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Changes in Benefit Obligation, Plan Assets and Funded Status for Company-Sponsored Benefit Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of year $ 286,598,000 $ 254,556,000  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Noncurrent assets 4,488,000 0  
Pension Benefit Plans
      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 333,257,000 307,658,000  
Service cost 1,738,000 2,485,000 7,725,000
Interest cost 13,375,000 14,693,000 15,092,000
Plan changes 0 0  
Actuarial losses (gains) (36,859,000) 30,612,000  
Medicare Part D subsidies received 0 0  
Benefits paid (18,123,000) (22,191,000)  
Benefit obligation at end of year 293,388,000 333,257,000 307,658,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 254,556,000 218,557,000  
Actual return on plan assets 34,779,000 37,308,000  
Employer contribution 15,386,000 20,882,000  
Fair value of plan assets at end of year 286,598,000 254,556,000 218,557,000
Funded status at end of year (6,790,000) (78,701,000)  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Noncurrent assets 4,488,000 0  
Current liabilities (364,000) (281,000)  
Noncurrent liabilities (10,914,000) (78,420,000)  
Net amount recognized (6,790,000) (78,701,000)  
Other Postretirement Employee Benefit Plans
      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 134,618,000 136,710,000  
Service cost 552,000 693,000 702,000
Interest cost 4,730,000 5,815,000 6,857,000
Plan changes 5,106,000 (5,278,000)  
Actuarial losses (gains) (30,322,000) 3,151,000  
Medicare Part D subsidies received 308,000 569,000  
Benefits paid (7,665,000) (7,042,000)  
Benefit obligation at end of year 107,327,000 134,618,000 136,710,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 19,000 18,000  
Actual return on plan assets 1,000 1,000  
Employer contribution 0 0  
Fair value of plan assets at end of year 20,000 19,000 18,000
Funded status at end of year (107,307,000) (134,599,000)  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Noncurrent assets 0 0  
Current liabilities (8,414,000) (8,856,000)  
Noncurrent liabilities (98,893,000) (125,743,000)  
Net amount recognized $ (107,307,000) $ (134,599,000)