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Defined Benefit Plans - Net Periodic Pension and Postretirement Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Pension Plans, Defined Benefit [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service costs $ 210 $ 190 $ 680 $ 570
Interest costs 380 450 1,210 1,330
Expected return on plan assets (420) (510) (1,430) (1,550)
Amortization of prior service cost 0 0 10 10
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 0 0 (2,750) 0
Amortization of net (gain)/loss 310 270 1,050 830
Net periodic benefit cost 480 400 4,270 1,190
Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service costs 0 0 0 0
Interest costs 10 10 20 30
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 0 0 0 0
Amortization of net (gain)/loss (10) (20) (30) (70)
Net periodic benefit cost $ 0 $ (10) $ (10) $ (40)