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Defined Benefit Plans (Details)
$ in Thousands
 4 Months Ended 8 Months Ended 12 Months Ended
May. 15, 2015
USD ($)
Mar. 09, 2015
USD ($)
May. 14, 2015
USD ($)
Dec. 31, 2015
USD ($)
Integer4
Integer7
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Integer5
Integer4
Integer7
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Compensation and Retirement Disclosure [Abstract]                
Number of qualified defined benefit pension plan | Integer4       1   1    
Number of plans for hourly employees merged to the qualified defined benefit pension plan | Integer4       2   2    
Change in Benefit Obligation                
Benefit obligation at beginning of year     $ 513,798   $ 484,079 $ 513,798 $ 443,313  
Service cost           739 1,682 $ 2,686
Interest cost           19,067 20,179 18,626
Actuarial (gain) loss           (27,817) 82,090  
Benefits paid [1]           (21,708) (33,466)  
Benefit obligation at end of year       $ 484,079   484,079 513,798 443,313
Change in plan assets                
Fair value of plan assets at beginning of year     $ 363,959   399,462 363,959 357,280  
Actual return on plan assets           2,954 28,074  
Employer contributions           54,257 12,071  
Benefits paid [1]           (21,708) (33,466)  
Fair value of plan assets at end of year       399,462   399,462 363,959 357,280
Underfunded status       (84,617)   (84,617) (149,839)  
Amounts recognized on our Conolidated Balance Sheets                
Current liabilities       (2,510)   (2,510) (2,978)  
Noncurrent liabilities       (82,107)   (82,107) (146,861)  
Net liability       (84,617)   (84,617) (149,839)  
Amounts recognized in accumulated other comprehensive loss                
Net actuarial loss       75,801   75,801 89,592  
Prior service cost       0   0 0  
Net loss recognized       75,801   75,801 89,592  
Defined Benefit Plan, lump-sum cash settlement             15,000  
Accumulated benefit obligation       $ 484,100   484,100 513,800  
Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive (Income) Loss                
Service cost           739 1,682 2,686
Interest cost           19,067 20,179 18,626
Expected return on plan assets           (22,366) (21,000) (19,829)
Amortization of actuarial (gain) loss           4,884 (23) 9,202
Amortization of prior service costs and other           0 0 90
Plan settlement/curtailment expense           (501) 0 (214)
Net periodic benefit cost           2,825 838 10,989
Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss                
Net actuarial (gain) loss           (8,406) 75,016 (97,171)
Amortization of actuarial gain (loss) [2]           (4,884) 23 (9,202)
Effects of settlements [2]           (501) 0 0
Amortization of prior service cost and other [2]           0 0 (304)
Total recognized in other comprehensive (income) loss           (13,791) 75,039 (106,677)
Total recognized in net periodic cost (benefit) and other comprehensive (income) loss           (10,966) $ 75,877 $ (95,688)
Defined Benefit Plans, Estimated Future Net Periodic Benefit Cost For The Next Year           1,800    
Defined Benefit Plan, Future Amortization of Loss           $ 1,900    
Weighted Average Assumptions Used in Measurement of Benefit Obligation                
Discount rate       4.05%   4.05% 3.75%  
Rate of compensation increases [3]       0.00%   0.00% 0.00%  
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost                
Discount rate     3.75% [4] 3.90% [4]     4.65% 3.75%
Expected long-term rate of return on plan assets     6.15% [4] 5.85% [4]     6.50% 6.50%
Rate of compensation increases [3]           0.00% 0.00% 0.00%
Pension Contributions                
Number of real property contributed to the qualified defined benefit pension plan | Integer7       4   4    
Contributed properties leaseback transaction lease term           10 years    
Number of extension options for contributed properties | Integer5           2    
Extension terms of contributed properties           5 years    
Annual rent escalation rate for contributed properties           2.00%    
Pension contributions $ 40,000 $ 10,000       $ 54,257 $ 12,071 $ 10,739
Lease payments included in pension contributions           1,300 1,100 $ 1,000
Estimated Future Contributions                
Estimated 2016 contributions           4,000    
Expected Future Benefit Payments                
2016       $ 22,796   22,796    
2017       22,391   22,391    
2018       23,755   23,755    
2019       24,879   24,879    
2020       25,796   25,796    
Years 2021-2025       $ 138,480   $ 138,480    
Equity Securities [Member]                
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost                
Defined Benefit Plan, Actual Plan Asset Allocations       42.00%   42.00%    
Large-Cap U.S. equity securities [Member]                
Change in plan assets                
Fair value of plan assets at beginning of year [5]     $ 111,599   91,622 $ 111,599    
Fair value of plan assets at end of year [5]       $ 91,622   $ 91,622 111,599  
Target Plan Asset Allocation                
Pension plan asset target allocation           23.00%    
Small- and mid-cap U.S. equity securities [Member]                
Change in plan assets                
Fair value of plan assets at beginning of year [6]     18,331   16,338 $ 18,331    
Fair value of plan assets at end of year [6]       16,338   $ 16,338 18,331  
Target Plan Asset Allocation                
Pension plan asset target allocation           4.00%    
International Equity Securities [Member]                
Change in plan assets                
Fair value of plan assets at beginning of year [7]     73,130   61,414 $ 73,130    
Fair value of plan assets at end of year [7]       61,414   $ 61,414 73,130  
Target Plan Asset Allocation                
Pension plan asset target allocation           16.00%    
Fixed Income Securities (e) [Member]                
Change in plan assets                
Fair value of plan assets at beginning of year [8]     125,706   178,019 $ 125,706    
Fair value of plan assets at end of year [8]       $ 178,019   $ 178,019 125,706  
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost                
Defined Benefit Plan, Actual Plan Asset Allocations       45.00%   45.00%    
Target Plan Asset Allocation                
Pension plan asset target allocation           45.00%    
Hedge Fund [Member]                
Change in plan assets                
Fair value of plan assets at beginning of year [9]     16,242   25,566 $ 16,242    
Fair value of plan assets at end of year [9]       $ 25,566   $ 25,566 16,242  
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost                
Defined Benefit Plan, Actual Plan Asset Allocations       7.00%   7.00%    
Target Plan Asset Allocation                
Pension plan asset target allocation           6.00%    
Real Estate Funds [Member]                
Change in plan assets                
Fair value of plan assets at beginning of year [10]     $ 17,802   $ 24,906 $ 17,802    
Fair value of plan assets at end of year [10]       $ 24,906   $ 24,906 $ 17,802  
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost                
Defined Benefit Plan, Actual Plan Asset Allocations       6.00%   6.00%    
Target Plan Asset Allocation                
Pension plan asset target allocation           6.00%    
Scenario, Forecast [Member]                
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost                
Expected long-term rate of return on plan assets         5.10%      
Emerging Markets Securities [Member] | International Equity Securities [Member]                
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost                
Defined Benefit Plan, Actual Plan Asset Allocations       16.00%   16.00% 23.00%  
[1] Benefits paid during the year ended December 31, 2014 include approximately $15 million of lump-sum cash payments to certain terminated and vested participants in settlement of pension obligations.
[2] Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 7, Retirement and Benefit Plans.
[3] Pension benefits for all salaried employees are frozen, resulting in an assumption for the rate of compensation increase of zero. In addition to the salaried benefits being frozen, there are currently no scheduled increases in pension benefit rates applicable to past service covering hourly employees who continue to accrue benefits.
[4] Prior to the remeasurement of our qualified defined benefit pension plan on May 15, 2015, the discount rate and expected rate of return on plan assets were 3.75% and 6.15%. The discount rate and expected rate of return on plan assets after the May 15, 2015 remeasurement were 3.90% and 5.85%, respectively.
[5] Invested in the Russell Large Cap U.S. Equity Fund at December 31, 2015 and the Russell Equity I Fund at December 31, 2014. Both funds seek returns that exceed the Russell 1000 Index by investing in large-capitalization stocks of the U.S. stock market. In addition, at December 31, 2015 and 2014, our investments in this category included the Russell 1000 Index Fund, which seeks to track the investment results of an index composed of large- and mid-capitalization stocks of the U.S. stock market.
[6] Invested in the Russell Equity II Fund. The fund seeks returns that exceed the Russell 2500 Index by investing in the small- and mid-capitalization stocks of the U.S. stock market.
[7] Invested in the Russell International Fund with Active Currency at December 31, 2015 and 2014, which benchmarks against the Russell Developed ex-U.S. Large Cap Index Net and seeks favorable total returns and additional diversification through investment in non-U.S. equity securities and active currency management. The fund participates primarily in the stock markets of Europe and the Pacific Rim and seeks to opportunistically add value through active investment in foreign currencies. In addition, at December 31, 2015 and 2014, our investments in this category included the Russell Emerging Market Fund, which benchmarks against the Russell Emerging Markets Index and is designed to maintain a broadly diversified exposure to emerging market countries. At December 31, 2015 and 2014, investments in emerging markets represent approximately 16% and 23%, respectively, of our international portfolio.
[8] Invested in the Russell Multi-Manager Bond Fund at December 31, 2015 and 2014. The fund seeks to outperform the Barclays Capital U.S. Aggregate Bond Index over a full market cycle. The fund is designed to provide current income and, as a secondary objective, capital appreciation through a variety of diversified strategies, including sector rotation, modest interest rate timing, security selection, and tactical use of high-yield and emerging market bonds. In addition, at December 31, 2015 and 2014, our investments in this category included the Russell Long Duration Fixed Income Fund, which is designed to provide maximum total return through diversified strategies including sector rotation, modest interest rate timing, security selection, and tactical use of high-yield, emerging market bonds and other non-index securities.
[9] Invested in the AQR Delta Offshore Fund. The fund seeks to produce high risk-adjusted returns while targeting a low long-term average correlation to traditional markets. The fund invests internationally in a broad range of instruments, including, but not limited to, equities, currencies, convertible securities, futures, forwards, options, swaps, and other derivative products. The fair value of the hedge fund is estimated using the NAV of the investments as a practical expedient for fair value. We have the ability to redeem these investments at NAV within the near term, and they are thus classified within Level 2.
[10] Invested in the Russell Real Estate Equity Fund. Real estate investments include those in limited partnerships that invest in various domestic commercial and residential real estate projects. The fair values of real estate assets are typically determined by using income and/or cost approaches or a comparable sales approach, taking into consideration discount and capitalization rates, financial conditions, local market conditions, and the status of the capital markets, and they are thus classified within Level 3. Notwithstanding the above, the variety of valuation bases adopted and quality of management data of the underlying assets 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. We have the ability to redeem the real estate investments with a 110-calendar-day written notice prior to a quarterly trade date.