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Employee Benefit Plans (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
401(k) retirement plan      
Expense recognized in the 401(k) retirement plan $ 3,600 $ 3,800 $ 3,900
Pension Plan      
Employee Benefits Plans      
Period of operating history and sufficient trading volume of invested entity (minimum) 5 years    
Fair value of plan assets $ 121,682 $ 124,372 $ 120,604
Investments as a percent of Plan assets 100.00% 100.00%  
Expected future pension benefit payments      
2016 $ 9,418    
2017 9,623    
2018 9,801    
2019 9,930    
2020 10,296    
2021-2025 56,274    
Total $ 105,342    
Pension Plan | Domestic Equities      
Employee Benefits Plans      
Target (as a percent) 50.00%    
Acceptable Range, Minimum (as a percent) 35.00%    
Acceptable Range, Maximum (as a percent) 75.00%    
Pension Plan | Large Cap Growth      
Employee Benefits Plans      
Target (as a percent) 22.50%    
Acceptable Range, Minimum (as a percent) 15.00%    
Acceptable Range, Maximum (as a percent) 30.00%    
Pension Plan | Large Cap Value      
Employee Benefits Plans      
Target (as a percent) 22.50%    
Acceptable Range, Minimum (as a percent) 15.00%    
Acceptable Range, Maximum (as a percent) 30.00%    
Pension Plan | Mid Cap Value      
Employee Benefits Plans      
Target (as a percent) 5.00%    
Acceptable Range, Minimum (as a percent) 5.00%    
Acceptable Range, Maximum (as a percent) 15.00%    
Pension Plan | Mid Cap Growth      
Employee Benefits Plans      
Target (as a percent) 0.00%    
Acceptable Range, Minimum (as a percent) 0.00%    
Acceptable Range, Maximum (as a percent) 10.00%    
Pension Plan | Domestic Fixed Income      
Employee Benefits Plans      
Target (as a percent) 35.00%    
Acceptable Range, Minimum (as a percent) 15.00%    
Acceptable Range, Maximum (as a percent) 50.00%    
Pension Plan | International Equities      
Employee Benefits Plans      
Target (as a percent) 15.00%    
Acceptable Range, Minimum (as a percent) 10.00%    
Acceptable Range, Maximum (as a percent) 25.00%