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Defined Benefit Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Components of Net Periodic Benefit Cost [Abstract]          
Service cost $ 1,307 $ 1,244 $ 3,922 $ 3,731  
Interest cost 1,912 1,871 5,735 5,613  
Other cost 1,101 1,104 3,304 3,313  
Expected return on assets (2,060) (1,894) (6,179) (5,683)  
Net periodic benefit cost 2,260 $ 2,325 6,782 $ 6,974  
Plan Assets [Abstract]          
Fair value of plan assets 130,830   130,830   $ 119,261
Employer Contributions [Abstract]          
Estimated employer contributions for the current fiscal year 7,500   7,500    
Defined Contribution Plan, Employer Discretionary Contribution Amount 1,280   2,560    
Quoted Prices in Active Markets for Identical Assets          
Plan Assets [Abstract]          
Fair value of plan assets 82,886   82,886   73,060
Significant Observable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 47,944   47,944   46,201
Significant Unobservable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets $ 0   $ 0   $ 0
Equity Securities [Member]          
Plan Assets [Abstract]          
Target plan asset allocations 55.00%   55.00%   55.00%
Fixed Income Securities          
Plan Assets [Abstract]          
Target plan asset allocations 45.00%   45.00%   45.00%
Cash and cash equivalents          
Plan Assets [Abstract]          
Fair value of plan assets $ 5,573   $ 5,573   $ 10,050
Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets          
Plan Assets [Abstract]          
Fair value of plan assets 5,573   5,573   10,050
Cash and cash equivalents | Significant Observable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 0   0   0
Cash and cash equivalents | Significant Unobservable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 0   0   0
Actively Managed | All Cap Equity          
Plan Assets [Abstract]          
Fair value of plan assets 6,189 [1]   6,189 [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 6,151 [1]   6,151 [1]   5,266 [2]
Actively Managed | All Cap Equity | Significant Observable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 38 [1]   38 [1]   24 [2]
Actively Managed | All Cap Equity | Significant Unobservable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 0 [1]   0 [1]   0 [2]
Actively Managed | U.S. Large Cap Equity          
Plan Assets [Abstract]          
Fair value of plan assets 48,102 [1]   48,102 [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 48,102 [1]   48,102 [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 [1]   0 [2]
Actively Managed | U.S. Large Cap Equity | Significant Unobservable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 0 [1]   0 [1]   0 [2]
Actively Managed | U.S. Mid Cap Equity          
Plan Assets [Abstract]          
Fair value of plan assets 8,893 [1]   8,893 [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 8,893 [1]   8,893 [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 [1]   0 [2]
Actively Managed | U.S. Mid Cap Equity | Significant Unobservable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 0 [1]   0 [1]   0 [2]
Actively Managed | U.S. Small Cap Equity          
Plan Assets [Abstract]          
Fair value of plan assets 8,403 [1]   8,403 [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 8,403 [1]   8,403 [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 [1]   0 [2]
Actively Managed | U.S. Small Cap Equity | Significant Unobservable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 0 [1]   0 [1]   0 [2]
Actively Managed | Non-U.S. Large Cap Equity          
Plan Assets [Abstract]          
Fair value of plan assets 5,764 [1]   5,764 [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 5,764 [1]   5,764 [1]   4,832 [2]
Actively Managed | Non-U.S. Large Cap Equity | Significant Observable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 0 [1]   0 [1]   0 [2]
Actively Managed | Non-U.S. Large Cap Equity | Significant Unobservable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 0 [1]   0 [1]   0 [2]
Actively Managed | REIT          
Plan Assets [Abstract]          
Fair value of plan assets 5,953 [1]   5,953 [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 [1]   0 [2]
Actively Managed | REIT | Significant Observable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 5,953 [1]   5,953 [1]   5,663 [2]
Actively Managed | REIT | Significant Unobservable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 0 [1]   0 [1]   0 [2]
Fixed Income          
Plan Assets [Abstract]          
Fair value of plan assets 41,953 [3]   41,953 [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 [3]   0 [4]
Fixed Income | Significant Observable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 41,953 [3]   41,953 [3]   40,514 [4]
Fixed Income | Significant Unobservable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets $ 0 [3]   $ 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.