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Employee Benefit Plans and Other Postretirement Plans Fair Value Measurements of Plan Assets (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2012
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2012
Significant other observable inputs (Level 2)
Dec. 31, 2013
Significant unobservable input (Level 3)
Dec. 31, 2013
Short-term Investments
Dec. 31, 2012
Short-term Investments
Dec. 31, 2013
Short-term Investments
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2012
Short-term Investments
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
Short-term Investments
Significant other observable inputs (Level 2)
Dec. 31, 2012
Short-term Investments
Significant other observable inputs (Level 2)
Dec. 31, 2013
Short-term Investments
Significant unobservable input (Level 3)
Dec. 31, 2012
Short-term Investments
Significant unobservable input (Level 3)
Dec. 31, 2013
U.S. Large Value
Dec. 31, 2012
U.S. Large Value
Dec. 31, 2013
U.S. Large Value
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2012
U.S. Large Value
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
U.S. Large Value
Significant other observable inputs (Level 2)
Dec. 31, 2012
U.S. Large Value
Significant other observable inputs (Level 2)
Dec. 31, 2013
U.S. Large Value
Significant unobservable input (Level 3)
Dec. 31, 2012
U.S. Large Value
Significant unobservable input (Level 3)
Dec. 31, 2013
U.S. Large Growth
Dec. 31, 2012
U.S. Large Growth
Dec. 31, 2013
U.S. Large Growth
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2012
U.S. Large Growth
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
U.S. Large Growth
Significant other observable inputs (Level 2)
Dec. 31, 2012
U.S. Large Growth
Significant other observable inputs (Level 2)
Dec. 31, 2013
U.S. Large Growth
Significant unobservable input (Level 3)
Dec. 31, 2012
U.S. Large Growth
Significant unobservable input (Level 3)
Dec. 31, 2013
U.S. Mid-Cap Value
Dec. 31, 2012
U.S. Mid-Cap Value
Dec. 31, 2013
U.S. Mid-Cap Value
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2012
U.S. Mid-Cap Value
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
U.S. Mid-Cap Value
Significant other observable inputs (Level 2)
Dec. 31, 2012
U.S. Mid-Cap Value
Significant other observable inputs (Level 2)
Dec. 31, 2013
U.S. Mid-Cap Value
Significant unobservable input (Level 3)
Dec. 31, 2012
U.S. Mid-Cap Value
Significant unobservable input (Level 3)
Dec. 31, 2013
U.S. Mid-Cap Growth
Dec. 31, 2012
U.S. Mid-Cap Growth
Dec. 31, 2013
U.S. Mid-Cap Growth
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2012
U.S. Mid-Cap Growth
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
U.S. Mid-Cap Growth
Significant other observable inputs (Level 2)
Dec. 31, 2012
U.S. Mid-Cap Growth
Significant other observable inputs (Level 2)
Dec. 31, 2013
U.S. Mid-Cap Growth
Significant unobservable input (Level 3)
Dec. 31, 2012
U.S. Mid-Cap Growth
Significant unobservable input (Level 3)
Dec. 31, 2013
Foreign Large Blend (Mutual Funds)
Dec. 31, 2012
Foreign Large Blend (Mutual Funds)
Dec. 31, 2013
Foreign Large Blend (Mutual Funds)
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2012
Foreign Large Blend (Mutual Funds)
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
Foreign Large Blend (Mutual Funds)
Significant other observable inputs (Level 2)
Dec. 31, 2012
Foreign Large Blend (Mutual Funds)
Significant other observable inputs (Level 2)
Dec. 31, 2013
Foreign Large Blend (Mutual Funds)
Significant unobservable input (Level 3)
Dec. 31, 2012
Foreign Large Blend (Mutual Funds)
Significant unobservable input (Level 3)
Dec. 31, 2013
Diversified Emerging Markets (Mutual Funds)
Dec. 31, 2012
Diversified Emerging Markets (Mutual Funds)
Dec. 31, 2013
Diversified Emerging Markets (Mutual Funds)
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2012
Diversified Emerging Markets (Mutual Funds)
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
Diversified Emerging Markets (Mutual Funds)
Significant other observable inputs (Level 2)
Dec. 31, 2012
Diversified Emerging Markets (Mutual Funds)
Significant other observable inputs (Level 2)
Dec. 31, 2013
Diversified Emerging Markets (Mutual Funds)
Significant unobservable input (Level 3)
Dec. 31, 2012
Diversified Emerging Markets (Mutual Funds)
Significant unobservable input (Level 3)
Dec. 31, 2013
Real Estate
Dec. 31, 2012
Real Estate
Dec. 31, 2013
Real Estate
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2012
Real Estate
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
Real Estate
Significant other observable inputs (Level 2)
Dec. 31, 2012
Real Estate
Significant other observable inputs (Level 2)
Dec. 31, 2013
Real Estate
Significant unobservable input (Level 3)
Dec. 31, 2012
Real Estate
Significant unobservable input (Level 3)
Dec. 31, 2013
Fixed Income (Mutual Funds)
Dec. 31, 2012
Fixed Income (Mutual Funds)
Dec. 31, 2013
Fixed Income (Mutual Funds)
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2012
Fixed Income (Mutual Funds)
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
Fixed Income (Mutual Funds)
Significant other observable inputs (Level 2)
Dec. 31, 2012
Fixed Income (Mutual Funds)
Significant other observable inputs (Level 2)
Dec. 31, 2013
Fixed Income (Mutual Funds)
Significant unobservable input (Level 3)
Dec. 31, 2012
Fixed Income (Mutual Funds)
Significant unobservable input (Level 3)
Dec. 31, 2013
U.S. Large-Cap Equity Blend
Dec. 31, 2013
U.S. Large-Cap Equity Blend
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
U.S. Large-Cap Equity Blend
Significant other observable inputs (Level 2)
Dec. 31, 2013
U.S. Large-Cap Equity Blend
Significant unobservable input (Level 3)
Dec. 31, 2013
U.S. Small and Mid-Cap Equity Blend
Dec. 31, 2013
U.S. Small and Mid-Cap Equity Blend
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
U.S. Small and Mid-Cap Equity Blend
Significant other observable inputs (Level 2)
Dec. 31, 2013
U.S. Small and Mid-Cap Equity Blend
Significant unobservable input (Level 3)
Dec. 31, 2013
Foreign Large Blend (Common/Collective Trust Funds)
Dec. 31, 2013
Foreign Large Blend (Common/Collective Trust Funds)
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
Foreign Large Blend (Common/Collective Trust Funds)
Significant other observable inputs (Level 2)
Dec. 31, 2013
Foreign Large Blend (Common/Collective Trust Funds)
Significant unobservable input (Level 3)
Dec. 31, 2013
Diversified Emerging Markets (Common/Collective Trust Funds)
Dec. 31, 2013
Diversified Emerging Markets (Common/Collective Trust Funds)
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
Diversified Emerging Markets (Common/Collective Trust Funds)
Significant other observable inputs (Level 2)
Dec. 31, 2013
Diversified Emerging Markets (Common/Collective Trust Funds)
Significant unobservable input (Level 3)
Dec. 31, 2013
Government Bonds
Dec. 31, 2012
Government Bonds
Dec. 31, 2013
Government Bonds
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2012
Government Bonds
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
Government Bonds
Significant other observable inputs (Level 2)
Dec. 31, 2012
Government Bonds
Significant other observable inputs (Level 2)
Dec. 31, 2013
Government Bonds
Significant unobservable input (Level 3)
Dec. 31, 2012
Government Bonds
Significant unobservable input (Level 3)
Dec. 31, 2013
Corporate Bonds
Dec. 31, 2012
Corporate Bonds
Dec. 31, 2013
Corporate Bonds
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2012
Corporate Bonds
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
Corporate Bonds
Significant other observable inputs (Level 2)
Dec. 31, 2012
Corporate Bonds
Significant other observable inputs (Level 2)
Dec. 31, 2013
Corporate Bonds
Significant unobservable input (Level 3)
Dec. 31, 2012
Corporate Bonds
Significant unobservable input (Level 3)
Dec. 31, 2013
U.S. Small Blend
Dec. 31, 2012
U.S. Small Blend
Dec. 31, 2013
U.S. Small Blend
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2012
U.S. Small Blend
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
U.S. Small Blend
Significant other observable inputs (Level 2)
Dec. 31, 2012
U.S. Small Blend
Significant other observable inputs (Level 2)
Dec. 31, 2013
U.S. Small Blend
Significant unobservable input (Level 3)
Dec. 31, 2012
U.S. Small Blend
Significant unobservable input (Level 3)
Dec. 31, 2013
Fixed Income (Common/Collective Trust Funds)
Dec. 31, 2013
Fixed Income (Common/Collective Trust Funds)
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
Fixed Income (Common/Collective Trust Funds)
Significant other observable inputs (Level 2)
Dec. 31, 2013
Fixed Income (Common/Collective Trust Funds)
Significant unobservable input (Level 3)
Dec. 31, 2013
Private Equity Securities
Dec. 31, 2013
Private Equity Securities
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
Private Equity Securities
Significant other observable inputs (Level 2)
Dec. 31, 2013
Private Equity Securities
Significant unobservable input (Level 3)
Dec. 31, 2013
Total Securities at Fair Value
Dec. 31, 2013
Total Securities at Fair Value
Quoted prices in active markets for identical assets (Level 1)
Dec. 31, 2013
Total Securities at Fair Value
Significant other observable inputs (Level 2)
Dec. 31, 2013
Total Securities at Fair Value
Significant unobservable input (Level 3)
Dec. 31, 2013
Receivables and Accrued Expenses
Defined Benefit Plan Disclosure [Line Items]                                                                                                                                                                                                                                                                    
Fair value of plan assets $ 772,082,000 $ 238,359,000 $ 136,771,000 $ 101,588,000 $ 9,904,000 $ 1,858,000 [1] $ 394,000 [1] $ 0 [1] $ 0 [1] $ 1,858,000 [1] $ 394,000 [1] $ 0 [1] $ 0 [1] $ 19,453,000 [2] $ 15,021,000 [2] $ 19,453,000 [2] $ 15,021,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 17,217,000 [2] $ 12,029,000 [2] $ 17,217,000 [2] $ 12,029,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 3,135,000 [2] $ 2,481,000 [2] $ 3,135,000 [2] $ 2,481,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 6,781,000 [2] $ 4,734,000 [2] $ 6,781,000 [2] $ 4,734,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 45,159,000 [2] $ 39,204,000 [2] $ 45,159,000 [2] $ 39,204,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 8,005,000 [2] $ 7,722,000 [2] $ 8,005,000 [2] $ 7,722,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 7,469,000 [2] $ 6,881,000 [2] $ 7,469,000 [2] $ 6,881,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 54,366,000 [2] $ 48,699,000 [2] $ 54,366,000 [2] $ 48,699,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 87,862,000 [1] $ 0 [1] $ 87,862,000 [1] $ 0 [1] $ 19,577,000 [1] $ 0 [1] $ 19,577,000 [1] $ 0 [1] $ 126,653,000 [1] $ 0 [1] $ 126,653,000 [1] $ 0 [1] $ 9,211,000 [1] $ 0 [1] $ 9,211,000 [1] $ 0 [1] $ 35,603,000 [1] $ 29,644,000 [1] $ 0 [1] $ 0 [1] $ 35,603,000 [1] $ 29,644,000 [1] $ 0 [1] $ 0 [1] $ 77,256,000 [1] $ 66,517,000 [1] $ 0 [1] $ 0 [1] $ 77,256,000 [1] $ 66,517,000 [1] $ 0 [1] $ 0 [1] $ 6,777,000 [1] $ 5,033,000 [1] $ 0 [1] $ 0 [1] $ 6,777,000 [1] $ 5,033,000 [1] $ 0 [1] $ 0 [1] $ 234,445,000 [1] $ 0 [1] $ 234,445,000 [1] $ 0 [1] $ 9,904,000 [3] $ 0 [3] $ 0 [3] $ 9,904,000 [3] $ 770,731,000 $ 161,585,000 $ 599,242,000 $ 9,904,000 $ 1,351,000
Investment commitment                                                                                                                                                                                                                                                         15,000,000          
Unfunded portion of investment commitment                                                                                                                                                                                                                                                         6,200,000          
Level 3 fair value of pension plans' assets [Roll Forward]                                                                                                                                                                                                                                                                    
Plan assets at fair value at beginning of period 772,082,000 238,359,000 136,771,000 101,588,000 0 1,858,000 [1] 394,000 [1] 0 [1] 0 [1] 1,858,000 [1] 394,000 [1] 0 [1] 0 [1] 19,453,000 [2] 15,021,000 [2] 19,453,000 [2] 15,021,000 [2] 0 [2] 0 [2] 0 [2] 0 [2] 17,217,000 [2] 12,029,000 [2] 17,217,000 [2] 12,029,000 [2] 0 [2] 0 [2] 0 [2] 0 [2] 3,135,000 [2] 2,481,000 [2] 3,135,000 [2] 2,481,000 [2] 0 [2] 0 [2] 0 [2] 0 [2] 6,781,000 [2] 4,734,000 [2] 6,781,000 [2] 4,734,000 [2] 0 [2] 0 [2] 0 [2] 0 [2] 45,159,000 [2] 39,204,000 [2] 45,159,000 [2] 39,204,000 [2] 0 [2] 0 [2] 0 [2] 0 [2] 8,005,000 [2] 7,722,000 [2] 8,005,000 [2] 7,722,000 [2] 0 [2] 0 [2] 0 [2] 0 [2] 7,469,000 [2] 6,881,000 [2] 7,469,000 [2] 6,881,000 [2] 0 [2] 0 [2] 0 [2] 0 [2] 54,366,000 [2] 48,699,000 [2] 54,366,000 [2] 48,699,000 [2] 0 [2] 0 [2] 0 [2] 0 [2] 87,862,000 [1] 0 [1] 87,862,000 [1] 0 [1] 19,577,000 [1] 0 [1] 19,577,000 [1] 0 [1] 126,653,000 [1] 0 [1] 126,653,000 [1] 0 [1] 9,211,000 [1] 0 [1] 9,211,000 [1] 0 [1] 35,603,000 [1] 29,644,000 [1] 0 [1] 0 [1] 35,603,000 [1] 29,644,000 [1] 0 [1] 0 [1] 77,256,000 [1] 66,517,000 [1] 0 [1] 0 [1] 77,256,000 [1] 66,517,000 [1] 0 [1] 0 [1] 6,777,000 [1] 5,033,000 [1] 0 [1] 0 [1] 6,777,000 [1] 5,033,000 [1] 0 [1] 0 [1] 234,445,000 [1] 0 [1] 234,445,000 [1] 0 [1] 9,904,000 [3] 0 [3] 0 [3] 9,904,000 [3] 770,731,000 161,585,000 599,242,000 9,904,000 1,351,000
Acquisitions         8,479,000                                                                                                                                                                                                                                                          
Purchases         975,000                                                                                                                                                                                                                                                          
Sales         0                                                                                                                                                                                                                                                          
Unrealized gain         450,000                                                                                                                                                                                                                                                          
Fair value of plan assets at plan year end $ 772,082,000 $ 238,359,000 $ 136,771,000 $ 101,588,000 $ 9,904,000 $ 1,858,000 [1] $ 394,000 [1] $ 0 [1] $ 0 [1] $ 1,858,000 [1] $ 394,000 [1] $ 0 [1] $ 0 [1] $ 19,453,000 [2] $ 15,021,000 [2] $ 19,453,000 [2] $ 15,021,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 17,217,000 [2] $ 12,029,000 [2] $ 17,217,000 [2] $ 12,029,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 3,135,000 [2] $ 2,481,000 [2] $ 3,135,000 [2] $ 2,481,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 6,781,000 [2] $ 4,734,000 [2] $ 6,781,000 [2] $ 4,734,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 45,159,000 [2] $ 39,204,000 [2] $ 45,159,000 [2] $ 39,204,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 8,005,000 [2] $ 7,722,000 [2] $ 8,005,000 [2] $ 7,722,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 7,469,000 [2] $ 6,881,000 [2] $ 7,469,000 [2] $ 6,881,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 54,366,000 [2] $ 48,699,000 [2] $ 54,366,000 [2] $ 48,699,000 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 87,862,000 [1] $ 0 [1] $ 87,862,000 [1] $ 0 [1] $ 19,577,000 [1] $ 0 [1] $ 19,577,000 [1] $ 0 [1] $ 126,653,000 [1] $ 0 [1] $ 126,653,000 [1] $ 0 [1] $ 9,211,000 [1] $ 0 [1] $ 9,211,000 [1] $ 0 [1] $ 35,603,000 [1] $ 29,644,000 [1] $ 0 [1] $ 0 [1] $ 35,603,000 [1] $ 29,644,000 [1] $ 0 [1] $ 0 [1] $ 77,256,000 [1] $ 66,517,000 [1] $ 0 [1] $ 0 [1] $ 77,256,000 [1] $ 66,517,000 [1] $ 0 [1] $ 0 [1] $ 6,777,000 [1] $ 5,033,000 [1] $ 0 [1] $ 0 [1] $ 6,777,000 [1] $ 5,033,000 [1] $ 0 [1] $ 0 [1] $ 234,445,000 [1] $ 0 [1] $ 234,445,000 [1] $ 0 [1] $ 9,904,000 [3] $ 0 [3] $ 0 [3] $ 9,904,000 [3] $ 770,731,000 $ 161,585,000 $ 599,242,000 $ 9,904,000 $ 1,351,000
[1] Investments in common/collective trust funds valued using NAV provided by the administrator of the funds. We use NAV as a practical expedient to fair value. The NAV is based on the value of the underlying assets owned by the fund, minus its liabilities, and then divided by the number of units outstanding. While the underlying assets are actively traded on an exchange, the funds are not. There are currently no redemption restrictions on these investments. There are certain funds with one-day redeemable notice.
[2] Investments in mutual funds valued at quoted market values on the last business day of the fiscal year.
[3] Investments in this category are invested in the Pantheon Global Secondary Fund IV, LP. The fund specializes in investments in the private equity secondary market and occasionally directly in private companies to maximize capital growth. Fund investments are carried at fair value as determined quarterly using the market approach to estimate the fair value of private investments. The market approach utilizes prices and other relevant information generated by market transactions, type of security, size of the position, degree of liquidity, restrictions on the disposition, latest round of financing data, current financial position, and operating results, among other factors. In circumstances where fair values are not provided with respect to any of the company's fund investments, the investment advisor will seek to determine the fair value of such investments based on information provided by the general partners or managers of such funds or from other sources. Audited financial statements are provided by fund management annually. Notwithstanding the above, the variety of valuation bases adopted and quality of management data of the ultimate underlying investee companies means that there are inherent difficulties in determining the value of the investments. Amounts realized on the sale of these investments may differ from the calculated values. Boise had originally committed to a $15.0 million investment, with $6.2 million of the commitment unfunded at December 31, 2013.