Summary of Significant Accounting Policies Cash and Cash Equivalents, Restricted Cash and Cash Equivalents (Tables)

12 Months Ended

Dec. 31, 2018

Restricted Cash and Cash Equivalents Items [Line Items]

Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]

Restricted Cash

The Company has lease agreements and business licenses with terms that require the Company to restrict cash through the termination dates of the agreements, which extend through 2024. Current and non-current restricted cash is included in Other current assets and Other non-current assets, respectively, on the Consolidated Balance Sheet.

The following table provides a reconciliation of the cash and cash equivalents between the Condensed Consolidated Balance Sheets and the Condensed Consolidated Statement of Cash Flows as of December 31, 2018, 2017 and 2016:

	December 31,
	2018		2017		2016
Cash and cash equivalents	$	279,906	$	207,534	$	165,011
Restricted cash included within other current assets	108		526		139
Restricted cash included within other non-current assets	248		102		420
Total cash, cash equivalents and restricted cash	$	280,262	$	208,162	$	165,570