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Fair value measurements (Details 2) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Concentration risks, percentage [Abstract]      
Percentage investment in common stock of mid-cap companies 9.00% 9.00% 20.00%
Percentage investment in common stock of small-cap companies 6.00% 7.00% 18.00%
Percentage investment in common stock of large-cap companies 18.00% 19.00% 28.00%
Percentage in fixed-income and other investments 65.00% 63.00% 32.00%
Percentage Investment in Target Date Investments 1.00% 1.00% 1.00%
Percentage investment in cash and cash equivalents 1.00% 1.00% 1.00%
Fair value, measurements, recurring [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure $ 81,051 $ 79,286 $ 79,058
Liabilities, fair value disclosure 4,951 3,052  
Fair value, measurements, recurring [Member] | RIN obligations      
Fair value measurements [Line Items]      
Liabilities, fair value disclosure 4,951 3,052  
Fair value, measurements, recurring [Member] | Money market funds [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure 1,442 1,420 1,087
Fair value, measurements, recurring [Member] | Insurance contract [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure 69,110 [1] 67,459 [2] 67,797 [3]
Fair value, measurements, recurring [Member] | Mortgage backed securities [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure 10,499 9,098 7,832
Fair value, measurements, recurring [Member] | US Treasury securities [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure   1,309 2,342
Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure 0 0 0
Liabilities, fair value disclosure 0 0  
Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member] | RIN obligations      
Fair value measurements [Line Items]      
Liabilities, fair value disclosure 0 0  
Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member] | Money market funds [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure 0 0 0
Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member] | Insurance contract [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure 0 [1] 0 [2] 0 [3]
Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member] | Mortgage backed securities [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure 0 0 0
Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member] | US Treasury securities [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure   0 0
Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure 81,051 79,286 79,058
Liabilities, fair value disclosure 4,951 3,052  
Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member] | RIN obligations      
Fair value measurements [Line Items]      
Liabilities, fair value disclosure 4,951 3,052  
Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member] | Money market funds [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure 1,442 1,420 1,087
Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member] | Insurance contract [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure 69,110 [1] 67,459 [2] 67,797 [3]
Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member] | Mortgage backed securities [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure 10,499 9,098 7,832
Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member] | US Treasury securities [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure   1,309 2,342
Fair value, measurements, recurring [Member] | Fair value, inputs, level 3 [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure 0 0 0
Liabilities, fair value disclosure 0 0  
Fair value, measurements, recurring [Member] | Fair value, inputs, level 3 [Member] | RIN obligations      
Fair value measurements [Line Items]      
Liabilities, fair value disclosure 0 0  
Fair value, measurements, recurring [Member] | Fair value, inputs, level 3 [Member] | Money market funds [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure 0 0 0
Fair value, measurements, recurring [Member] | Fair value, inputs, level 3 [Member] | Insurance contract [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure 0 [1] 0 [2] 0 [3]
Fair value, measurements, recurring [Member] | Fair value, inputs, level 3 [Member] | Mortgage backed securities [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure $ 0 0 0
Fair value, measurements, recurring [Member] | Fair value, inputs, level 3 [Member] | US Treasury securities [Member]      
Fair value measurements [Line Items]      
Assets, fair value disclosure   $ 0 $ 0
[1] The insurance contract invests approximately 9 percent in common stock of mid-cap companies, 6 percent in common stock of small-cap companies, 18 percent in common stock of large-cap companies, 65 percent in fixed-income investments, 1 percent in target date investments and 1 percent in cash equivalents.
[2] The insurance contract invests approximately 9 percent in common stock of mid-cap companies, 7 percent in common stock of small-cap companies, 19 percent in common stock of large-cap companies, 63 percent in fixed-income investments, 1 percent in target date investments and 1 percent in cash equivalents.
[3] The insurance contract invests approximately 20 percent in common stock of mid-cap companies, 18 percent in common stock of small-cap companies, 28 percent in common stock of large-cap companies, 32 percent in fixed-income investments, 1 percent in target date investments and 1 percent in cash equivalents.