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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Fair Value Measurements) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Mutual Funds [Member]    
Percent Invested in High-Quality Intermediate and Long-Term Investment Grade Securities 72.00%  
Percent Invested in Diversified Portfolio of Fixed-Income Instruments of Varying Maturities 22.00%  
Defined Benefit Plan, Fair Vale Measurements, Mutual Funds, Percent Invested in US Small/Mid Cap Equities that Track Russell 2500 Growth Index 6.00%  
Level 1 [Member]    
Fair Value of Plan Assets $ 172,992 $ 248,214
Level 1 [Member] | Cash and Cash Equivalents [Member]    
Fair Value of Plan Assets 5,591 6,586
Level 1 [Member] | Equity Securities, U.S. Small and Mid Cap [Member]    
Fair Value of Plan Assets [1]   1,136
Level 1 [Member] | Equity Securities, International Companies [Member]    
Fair Value of Plan Assets   13,782
Level 1 [Member] | Mutual Funds [Member]    
Fair Value of Plan Assets [2]   226,710
Level 1 [Member] | Domestic Equity Securities [Member]    
Fair Value of Plan Assets [3] 26,253  
Level 1 [Member] | Global and International Equity Securities [Member]    
Fair Value of Plan Assets [4] 411  
Level 1 [Member] | Emerging Markets [Member]    
Fair Value of Plan Assets [5] 1,831  
Level 1 [Member] | Fixed Income Securities [Member]    
Fair Value of Plan Assets [6] 138,906  
Level 1 [Member] | Alternative Securities [Member]    
Fair Value of Plan Assets [7] 0  
Level 1 [Member] | Collective Investments, U.S. Large Cap [Member]    
Fair Value of Plan Assets [8]   0
Level 1 [Member] | Collective Investments, Developed Markets [Member]    
Fair Value of Plan Assets [9]   0
Level 1 [Member] | Collective Investments, Emerging Markets [Member]    
Fair Value of Plan Assets [10]   0
Level 2 [Member]    
Fair Value of Plan Assets 119,208 88,845
Level 2 [Member] | Cash and Cash Equivalents [Member]    
Fair Value of Plan Assets 0 0
Level 2 [Member] | Equity Securities, U.S. Small and Mid Cap [Member]    
Fair Value of Plan Assets [1]   0
Level 2 [Member] | Equity Securities, International Companies [Member]    
Fair Value of Plan Assets   0
Level 2 [Member] | Mutual Funds [Member]    
Fair Value of Plan Assets [2]   0
Level 2 [Member] | Domestic Equity Securities [Member]    
Fair Value of Plan Assets [3] 25,619  
Level 2 [Member] | Global and International Equity Securities [Member]    
Fair Value of Plan Assets [4] 25,733  
Level 2 [Member] | Emerging Markets [Member]    
Fair Value of Plan Assets [5] 23,681  
Level 2 [Member] | Fixed Income Securities [Member]    
Fair Value of Plan Assets [6] 0  
Level 2 [Member] | Alternative Securities [Member]    
Fair Value of Plan Assets [7] 44,175  
Level 2 [Member] | Collective Investments, U.S. Large Cap [Member]    
Fair Value of Plan Assets [8]   30,005
Level 2 [Member] | Collective Investments, Developed Markets [Member]    
Fair Value of Plan Assets [9]   29,879
Level 2 [Member] | Collective Investments, Emerging Markets [Member]    
Fair Value of Plan Assets [10]   28,961
Level 3 [Member]    
Fair Value of Plan Assets 292,200 337,059
Level 3 [Member] | Cash and Cash Equivalents [Member]    
Fair Value of Plan Assets 5,591 6,586
Level 3 [Member] | Equity Securities, U.S. Small and Mid Cap [Member]    
Fair Value of Plan Assets [1]   1,136
Level 3 [Member] | Equity Securities, International Companies [Member]    
Fair Value of Plan Assets   13,782
Level 3 [Member] | Mutual Funds [Member]    
Fair Value of Plan Assets [2]   226,710
Level 3 [Member] | Domestic Equity Securities [Member]    
Fair Value of Plan Assets [3] 51,872  
Level 3 [Member] | Global and International Equity Securities [Member]    
Fair Value of Plan Assets [4] 26,144  
Level 3 [Member] | Emerging Markets [Member]    
Fair Value of Plan Assets [5] 25,512  
Level 3 [Member] | Fixed Income Securities [Member]    
Fair Value of Plan Assets [6] 138,906  
Level 3 [Member] | Alternative Securities [Member]    
Fair Value of Plan Assets [7] $ 44,175  
Level 3 [Member] | Collective Investments, U.S. Large Cap [Member]    
Fair Value of Plan Assets [8]   30,005
Level 3 [Member] | Collective Investments, Developed Markets [Member]    
Fair Value of Plan Assets [9]   29,879
Level 3 [Member] | Collective Investments, Emerging Markets [Member]    
Fair Value of Plan Assets [10]   $ 28,961
[1] These are managed investments in U.S. small/mid cap equities that track the Russell 2500 Growth index.
[2] The mutual funds were 72% invested in high-quality intermediate and long-term investment grade securities, 22% invested in a diversified portfolio of fixed-income instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements and debt securities, and 6% invested in U.S. small/mid-cap equities that track the Russell 2500 Growth index.
[3] Level 1 assets are managed investments in U.S. small/mid-cap equities that track the Russell 2500 Growth index or Russell 2500 Value index. Level 2 assets are collective investments, which are invested in U.S. large-cap equities that track the S&P 500.
[4] These collective investments are invested in equity funds of developed markets outside of the U.S. and Canada that track the MSCI EAFE Value index or MSCI EAFE Growth index.
[5] Level 1 assets are mutual funds which are invested in the common stock of companies located (or with primary operations) in emerging markets that track the MSCI Emerging Markets index. Level 2 assets are collective investments in the common stock of companies located (or with primary operations) in emerging markets that track the MSCI Emerging Markets index.
[6] These are mutual funds and investments in a diversified portfolio of fixed income instruments of varying maturities representing corporates, sovereign debt, U.S. treasuries, and municipals that track the Barclay's Long Term Credit index.
[7] These are collective investments in inflation-indexed bonds, securities of real estate companies, commodity index-linked notes, fixed income securities, foreign currencies, securities of natural resource companies, master limited partnerships, publicly listed infrastructure companies, floating-rate debt, securities of global agriculture companies and securities of global timber companies.
[8] These collective investments are invested in U.S. large cap equities that track the S&P 500.
[9] These collective investments are invested in equity funds of developed markets outside of the United States & Canada, which track the MSCI EAFE Value or MSCI EAFE Growth index.
[10] These collective investments are invested in equity funds of emerging markets outside of the United States & Canada, which track the MSCI Emerging Markets index.