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Defined Benfit Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Components of Net Periodic Benefit Cost [Abstract]      
Service cost $ 1,326 $ 1,240  
Interest cost 1,903 1,878  
Other cost 1,038 1,111  
Expected return on assets (2,066) (1,895)  
Net periodic benefit cost 2,201 $ 2,334  
Plan Assets [Abstract]      
Fair value of plan assets 122,966   $ 119,261
Employer Contributions [Abstract]      
Estimated employer contributions for the current fiscal year 7,500    
Defined Contribution Plan, Employer Discretionary Contribution Amount 0    
Quoted Prices in Active Markets for Identical Assets      
Plan Assets [Abstract]      
Fair value of plan assets 76,233   73,060
Significant Observable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets 46,733   46,201
Significant Unobservable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets $ 0   $ 0
Equity Securities [Member]      
Plan Assets [Abstract]      
Target plan asset allocations 55.00%   55.00%
Fixed Income Securities      
Plan Assets [Abstract]      
Target plan asset allocations 45.00%   45.00%
Cash and cash equivalents      
Plan Assets [Abstract]      
Fair value of plan assets $ 5,725   $ 10,050
Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets      
Plan Assets [Abstract]      
Fair value of plan assets 5,725   10,050
Cash and cash equivalents | Significant Observable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets 0   0
Cash and cash equivalents | Significant Unobservable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets 0   0
Actively Managed | All Cap Equity      
Plan Assets [Abstract]      
Fair value of plan assets 5,955 [1]   5,290 [2]
Actively Managed | All Cap Equity | Quoted Prices in Active Markets for Identical Assets      
Plan Assets [Abstract]      
Fair value of plan assets 5,926 [1]   5,266 [2]
Actively Managed | All Cap Equity | Significant Observable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets 29 [1]   24 [2]
Actively Managed | All Cap Equity | Significant Unobservable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets 0 [1]   0 [2]
Actively Managed | U.S. Large Cap Equity      
Plan Assets [Abstract]      
Fair value of plan assets 43,579 [1]   39,534 [2]
Actively Managed | U.S. Large Cap Equity | Quoted Prices in Active Markets for Identical Assets      
Plan Assets [Abstract]      
Fair value of plan assets 43,579 [1]   39,534 [2]
Actively Managed | U.S. Large Cap Equity | Significant Observable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets 0 [1]   0 [2]
Actively Managed | U.S. Large Cap Equity | Significant Unobservable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets 0 [1]   0 [2]
Actively Managed | U.S. Mid Cap Equity      
Plan Assets [Abstract]      
Fair value of plan assets 8,634 [1]   7,021 [2]
Actively Managed | U.S. Mid Cap Equity | Quoted Prices in Active Markets for Identical Assets      
Plan Assets [Abstract]      
Fair value of plan assets 8,634 [1]   7,021 [2]
Actively Managed | U.S. Mid Cap Equity | Significant Observable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets 0 [1]   0 [2]
Actively Managed | U.S. Mid Cap Equity | Significant Unobservable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets 0 [1]   0 [2]
Actively Managed | U.S. Small Cap Equity      
Plan Assets [Abstract]      
Fair value of plan assets 7,256 [1]   6,357 [2]
Actively Managed | U.S. Small Cap Equity | Quoted Prices in Active Markets for Identical Assets      
Plan Assets [Abstract]      
Fair value of plan assets 7,256 [1]   6,357 [2]
Actively Managed | U.S. Small Cap Equity | Significant Observable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets 0 [1]   0 [2]
Actively Managed | U.S. Small Cap Equity | Significant Unobservable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets 0 [1]   0 [2]
Actively Managed | Non-U.S. Large Cap Equity      
Plan Assets [Abstract]      
Fair value of plan assets 5,113 [1]   4,832 [2]
Actively Managed | Non-U.S. Large Cap Equity | Quoted Prices in Active Markets for Identical Assets      
Plan Assets [Abstract]      
Fair value of plan assets 5,113 [1]   4,832 [2]
Actively Managed | Non-U.S. Large Cap Equity | Significant Observable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets [1]   0 [2]
Actively Managed | Non-U.S. Large Cap Equity | Significant Unobservable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets [1]   0 [2]
Actively Managed | REIT      
Plan Assets [Abstract]      
Fair value of plan assets 5,702 [1]   5,663 [2]
Actively Managed | REIT | Quoted Prices in Active Markets for Identical Assets      
Plan Assets [Abstract]      
Fair value of plan assets 0 [1]   0 [2]
Actively Managed | REIT | Significant Observable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets 5,702 [1]   5,663 [2]
Actively Managed | REIT | Significant Unobservable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets 0 [1]   0 [2]
Fixed Income      
Plan Assets [Abstract]      
Fair value of plan assets 41,002 [3]   40,514 [4]
Fixed Income | Quoted Prices in Active Markets for Identical Assets      
Plan Assets [Abstract]      
Fair value of plan assets 0 [3]   0 [4]
Fixed Income | Significant Observable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets 41,002 [3]   40,514 [4]
Fixed Income | Significant Unobservable Inputs      
Plan Assets [Abstract]      
Fair value of plan assets $ 0 [3]   $ 0 [4]
[1] Actively managed portfolio of securities with the goal to exceed the stated benchmark performance.
[2] Actively managed portfolio of securities with the goal to exceed the stated benchmark performance.
[3] Actively managed portfolio of fixed income securities with the goal to exceed the Barclays 1-5 Year Government/Credit, Barclays Intermediate Government/Credit, and Merrill Lynch Preferred Stock Fixed Rate.
[4] Actively managed portfolio of fixed income securities with the goal to exceed the Barclays 1-5 Year Government/Credit, Barclays Intermediate Government/Credit, and Merrill Lynch Preferred Stock Fixed Rate.