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Pension and Other Retirement Plans (Schedule of fair value and allocation of plan assets) (Details) - Pension Plan - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets $ 204,182 $ 204,581 $ 330,797
Cash and money market funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets 1,865 4,178  
U.S. Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets 58,645 62,314  
International Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets 32,079 28,669  
Domestic Corporate and Government Debt Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets 52,136 54,427  
Domestic Corporate Debt Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets 51,768 49,074  
International Corporate and Government Debt Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets 7,689 5,919  
Level I - Fair Value, Inputs      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets 12,689 8,512  
Level I - Fair Value, Inputs | Cash and money market funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets 1,865 4,178  
Level I - Fair Value, Inputs | International Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets 10,824 4,334  
Level II - Fair Value, Inputs      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets 191,493 196,069  
Level II - Fair Value, Inputs | U.S. Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets 58,645 62,314  
Level II - Fair Value, Inputs | International Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets 21,255 24,335  
Level II - Fair Value, Inputs | Domestic Corporate and Government Debt Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets 52,136 54,427  
Level II - Fair Value, Inputs | Domestic Corporate Debt Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets 51,768 49,074  
Level II - Fair Value, Inputs | International Corporate and Government Debt Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of plan assets $ 7,689 $ 5,919