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Employee Benefit Plans: Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis, Employee Benefits (Details) - Pension Plans, Defined Benefit [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Defined Benefit Plan, Fair Value of Plan Assets $ 288,622 $ 299,533 $ 280,362
Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning of period 34,753 38,188  
Purchase 491 454  
Unrealized gain (loss) 1,644 1,789  
Realized gain (loss) 1 322  
Settlements 0 (6,000)  
Balance, end of period 36,889 34,753  
Defined Benefit Plan, Fair Value of Plan Assets 36,889 34,753  
Common Collective Trust - Real Estate      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Defined Benefit Plan, Fair Value of Plan Assets 13,347 13,583  
Common Collective Trust - Real Estate | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Defined Benefit Plan, Fair Value of Plan Assets 11,143 [1] 9,719  
Hedge Funds      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Defined Benefit Plan, Fair Value of Plan Assets 25,746 25,034  
Hedge Funds | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Defined Benefit Plan, Fair Value of Plan Assets $ 25,746 [2] $ 25,034  
[1] The underlying net asset value in the Common Collective Trust - Real Estate fund is determined by appraisal of the properties held in the Trust. As part of the Trustee's valuation process, properties are externally appraised generally on an annual basis. The appraisals are conducted by reputable independent appraisal firms and signed by appraisers that are members of the Appraisal Institute, with the professional designation of Member, Appraisal Institute. All external appraisals are performed in accordance with the Uniform Standards of Professional Appraisal Practices. We receive monthly statements from the Trustee along with the annual schedule of investments and rely on these reports for pricing the units of the fund. The fund does contain a participant withdrawal policy.
[2] The fair value of the Hedge Funds is determined based on pricing provided or reviewed by the third-party administrator to our investment managers. While the input amounts used by the pricing vendor in determining fair value are not provided, and therefore, unavailable for our review, the asset results are reviewed and monitored to ensure the fair values are reasonable and in line with market experience in similar asset classes. Additionally, the audited financial statements of the funds are reviewed at the time they are issued.