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Level 4 Retirement and Benefit Plans (Details) (USD $)
 3 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2014
Scenario, Forecast [Member]
Jul. 31, 2014
Subsequent Event [Member]
Net periodic benefit cost [Abstract]            
Service cost $ 414,000 $ 671,000 $ 815,000 $ 1,342,000    
Interest cost 4,929,000 4,650,000 10,080,000 9,292,000    
Expected return on plan assets (5,258,000) (4,916,000) (10,526,000) (9,782,000)    
Amortization of actuarial (gain) loss (6,000) 2,281,000 (12,000) 4,537,000    
Amortization of prior service costs 0 22,000 0 45,000    
Net periodic benefit cost 79,000 2,708,000 357,000 5,434,000    
Pension contributions [Abstract]            
Pension contributions     780,000 9,970,000   10,800,000
Estimated remaining 2014 contributions         $ 11,500,000