Summary of Business and Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Schedule of Cash and Cash Equivalents

The following table summarizes the Company's cash and cash equivalents as at September 30, 2018 and December 31, 2017 (in thousands):

	September 30, 2018	December 31, 2017
Cash and cash equivalents, unrestricted	770,036	779,345
Cash and cash equivalents, restricted	333	332
Total unrestricted and restricted cash and cash equivalents	770,369	779,677