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Newly Adopted Accounting Pronouncements (Details 2) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]          
Cash and Cash Equivalents   $ 54,001   $ 58,398  
Restricted Cash   645   653  
Total Cash, Cash Equivalents and Restricted Cash at end of period shown in the Condensed Consolidated Statement of Cash Flows $ 45,629 $ 54,646   $ 59,051 $ 58,550
Selling and Administrative Expense | Scenario, Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Net benefit cost (credit) 53        
Other (Expense) Income, Net | Scenario, Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Net benefit cost (credit) $ 53        
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