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Newly Adopted Accounting Pronouncements (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]            
Cash and Cash Equivalents     $ 53,901   $ 58,398  
Restricted Cash     543   653  
Total Cash, Cash Equivalents and Restricted Cash at end of period shown in the Condensed Consolidated Statement of Cash Flows $ 54,548 $ 54,548 $ 54,444   $ 59,051 $ 58,550
Selling and Administrative Expense | Scenario, Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net benefit cost (187) 134        
Other Expense, Net | Scenario, Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net benefit cost $ (187) $ 134        
Accounting Standards Update 2016-16            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets       $ 94    
ASU 2016-16, Increase (Decrease) in long-term deferred charge       1,281    
Deferred Tax Asset, Intra-entity Transfer, Asset Other than Inventory       1,187    
Accounting Standards Update 2018-02            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets       $ 1,263