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Severance and Restructuring (Tables)
3 Months Ended
Mar. 31, 2017
Severance and Restructuring [Abstract]  
Components of and Changes in Severance and Restructuring Accruals
    Employee        
    Termination     Restructuring  
    Costs     and Other  
    (Amounts in Thousands)  
Balance at December 31, 2016 $ 1,326   $ 1,786  
Provision   888      
Utilization   (684 )   (74 )
Balance at March 31, 2017 $ 1,530   $ 1,712