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Defined Benefit Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Components of Net Periodic Benefit Cost [Abstract]          
Service cost $ 1,288 $ 1,249 $ 2,614 $ 2,490  
Interest cost 1,920 1,858 3,823 3,736  
Other cost 1,165 1,091 2,203 2,201  
Expected return on assets (2,053) (1,893) (4,119) (3,788)  
Net periodic benefit cost 2,320 $ 2,305 4,521 $ 4,639  
Plan Assets [Abstract]          
Fair value of plan assets 126,911   126,911   $ 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   1,280    
Quoted Prices in Active Markets for Identical Assets          
Plan Assets [Abstract]          
Fair value of plan assets 79,324   79,324   73,060
Significant Observable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 47,587   47,587   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 $ 5,812   $ 5,812   $ 10,050
Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets          
Plan Assets [Abstract]          
Fair value of plan assets 5,812   5,812   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 6,001 [1]   6,001 [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 5,965 [1]   5,965 [1]   5,266 [2]
Actively Managed | All Cap Equity | Significant Observable Inputs          
Plan Assets [Abstract]          
Fair value of plan assets 36 [1]   36 [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 45,599 [1]   45,599 [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 45,599 [1]   45,599 [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 8,748 [1]   8,748 [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 8,748 [1]   8,748 [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 7,697 [1]   7,697 [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 7,697 [1]   7,697 [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 5,503 [1]   5,503 [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 5,503 [1]   5,503 [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 5,859 [1]   5,859 [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 5,859 [1]   5,859 [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 41,692 [3]   41,692 [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 41,692 [3]   41,692 [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.