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Employee Benefit Plans (Details 5) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Fair Value $ 15,031 $ 14,933 $ 13,532
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 13,229 13,886  
Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,802 1,047  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 0  
Cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,663 1,937  
Cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,663 1,937  
Cash equivalents | Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 0  
Cash equivalents | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 0  
U.S. large-cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 6,191 [1] 7,252  
U.S. large-cap | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 6,191 [1] 7,252  
U.S. large-cap | Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 [1] 0  
U.S. large-cap | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 [1] 0  
U.S. mid-cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 2,094 [2] 921  
U.S. mid-cap | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 2,094 [2] 921  
U.S. mid-cap | Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 [2] 0  
U.S. mid-cap | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 [2] 0  
U.S. small-cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 820 [3] 1,131  
U.S. small-cap | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 820 [3] 1,131  
U.S. small-cap | Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 [3] 0  
U.S. small-cap | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 [3] 0  
International      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,778 [4] 1,895  
International | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,778 [4] 1,895  
International | Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 [4] 0  
International | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 [4] 0  
Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 478 [5] 486  
Real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 478 [5] 486  
Real estate | Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 [5] 0  
Real estate | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 [5] 0  
Commodities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 205 [6] 264  
Commodities | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 205 [6] 264  
Commodities | Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 [6] 0  
Commodities | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 [6] 0  
U.S. gov't agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,802 [7] 1,047  
U.S. gov't agency obligations | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 [7] 0  
U.S. gov't agency obligations | Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,802 [7] 1,047  
U.S. gov't agency obligations | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value $ 0 [7] $ 0  
[1] This category is comprised of low-cost equity index funds not actively managed that track the S&P 500.
[2] This category is comprised of low-cost equity index funds not actively managed that track the MSCI U.S. mid-cap 450.
[3] This category is comprised of actively managed mutual funds.
[4] At December 31, 2015 and 2014, 31% of this category is comprised of low-cost equity index funds not actively managed that track the MSCI EAFE.
[5] This category is comprised of low-cost real estate index exchange traded funds.
[6] This category is comprised of exchange traded funds investing in agricultural and energy commodities.
[7] This category is comprised of individual bonds.