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Cash and Cash Equivalents (Tables)
12 Months Ended
Dec. 31, 2015
Cash and Cash Equivalents [Abstract]  
Cash and Cash Equivalents
The carrying values of the Company's cash and cash equivalents are as follows:
 
As of December 31,
 
2015
 
2014
 
(in thousands)
Cash
$
59,270

 
$
35,748

Cash equivalents
5,946

 
8,998

Restricted cash - deferred compensation plan
117

 
498

Restricted cash - letters of credit
4,629

 
5,696

Total cash and cash equivalents
$
69,962

 
$
50,940