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Cash and Cash Equivalents (Tables)
12 Months Ended
Dec. 31, 2016
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,
 
2016
 
2015
 
(in thousands)
Cash
$
85,047

 
$
59,270

Cash equivalents
9,013

 
5,946

Restricted cash - deferred compensation plan

 
117

Restricted cash - letters of credit
4,253

 
4,629

Total cash and cash equivalents
$
98,313

 
$
69,962