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Pension Liability (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
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Funded (Unfunded) Status of Plan $ (19,781)   $ (19,781)   $ (18,836)
Defined Benefit Plan, Interest Cost 236 $ 256 500 $ 512  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (126) (132) (266) (264)  
Pension Cost (Reversal of Cost) 173 $ 212 367 $ 423  
Payments through April 30, 2024 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 800   800    
Payments from May 1, 2024 through November 30, 2033 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 1,800   $ 1,800