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Net Periodic Benefit Cost-Defined Benefit Plans (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Net periodic benefit cost of the domestic non-contributory defined benefit plan          
Service cost $ 16,000 $ 140,000 $ 32,000 $ 280,000  
Interest cost 189,000 214,000 378,000 429,000  
Expected return on plan assets (210,000) (289,000) (491,000) (577,000)  
Amortization of net loss 40,000 53,000 80,000 105,000  
Net periodic (benefit) cost 35,000 $ 118,000 (1,000) $ 237,000  
Expected contribution to Pension Plan in 2015         $ 600,000
Employer contributions made to the defined benefit plan     465,000    
Anticipated additional contributions anticipated during the remainder of 2015 $ 400,000   $ 400,000