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Employee Benefit Plans - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Supplemental executive retirement plan $ 11,476,000   $ 11,476,000   $ 10,197,000
Foreign Pension Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined benefit plan arrangement minimum age     60 years    
Completed at least credited service period     5 years    
Defined benefit plan assumptions used calculating benefit obligation benefits payable per service year     one-half month’s salary for each year of credited service    
Net periodic benefit cost 64,000 $ 68,000 $ 196,000 $ 199,000  
Accumulated postretirement benefit obligation 1,800,000   1,800,000   1,600,000
Employer contributions to benefit plans     $ 0    
Supplemental Executive Retirement Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined benefit plan arrangement minimum age     55 years    
Completed at least credited service period     10 years    
Net periodic benefit cost 426,000 365,000 $ 1,278,000 1,094,000  
Employer contributions to benefit plans     $ 0    
Normal retirement age     65 years    
Early retirement age     55 years    
Vesting percentage under the plan for attaining age 55 and 10 years of service     100.00%    
Vesting percentage under the plan prior to attaining age 55 and 10 years of service     0.00%    
Defined benefit plan employees minimum requisition period under specific conditions     5 years    
Benefits payable targeted percentage     45.00%    
Period in which the executive officer earned the highest salary and bonus     3 years    
Employment period for computation of benefit     10 years    
Eligible age under condition one for reduced benefits under the plan     62 years    
Eligible service under condition one for reduced benefits under plan     10 years    
Eligible age under condition two for reduced benefits under plan     55 years    
Eligible service under condition two for reduced benefits under plan     25 years    
Lump sum payment period     10 years    
Supplemental executive retirement plan 11,500,000   $ 11,500,000   10,200,000
Supplemental Executive Retirement Health Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Net periodic benefit cost   $ 900,000   1,000,000  
Accumulated postretirement benefit obligation $ 0   $ 0   $ 0
Lump-sum payment to the participant in SERHP       3,900,000  
Settlement loss       $ 700,000