Cash and Cash Equivalents (Tables)

12 Months Ended

Dec. 31, 2017

Cash and Cash Equivalents [Abstract]

Schedule of Carrying Values of Cash and Cash Equivalents

The carrying values of the Company's cash and cash equivalents are as follows:

	As of December 31,
	2017		2016
	(in thousands)
Cash	$	70,459	$	85,047
Cash equivalents	193,315		9,013
Restricted cash - letters of credit	3,872		4,253
Total cash and cash equivalents	$	267,646	$	98,313