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Severance and Other Charges (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restructuring Reserve    
Beginning balance, December 31, 2016 $ 6,150  
Additions for costs expensed 1,037 $ 606
Other adjustments 63  
Severance and other payments (2,833)  
Ending balance, March 31, 2017 4,417  
International Services    
Restructuring Reserve    
Beginning balance, December 31, 2016 4,464  
Additions for costs expensed 270  
Other adjustments 5  
Severance and other payments (1,376)  
Ending balance, March 31, 2017 3,363  
U.S. Services    
Restructuring Reserve    
Beginning balance, December 31, 2016 1,686  
Additions for costs expensed 767  
Other adjustments 58  
Severance and other payments (1,457)  
Ending balance, March 31, 2017 $ 1,054