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Summary of Significant Accounting Policies - Cash Flow Statement As Adjusted (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other investing activities	$ (765)	$ 2,597	$ 8,031
Net cash provided by (used in) investing activities	6,927	(251,477)	73,028
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash	(4,733)	5,544	(3,374)
Net increase in cash, cash equivalents, and restricted cash		57,106	221,784
Cash, cash equivalents, and restricted cash at beginning of year	450,125	393,019	171,235
Cash, cash equivalents, and restricted cash at end of the period	637,566	450,125	393,019
Previously Reported | Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other investing activities		567	(8,211)
Net cash provided by (used in) investing activities		(248,313)	72,848
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash		5,510	(3,417)
Net increase in cash, cash equivalents, and restricted cash		60,236	221,561
Cash, cash equivalents, and restricted cash at beginning of year	449,511	389,275	167,714
Cash, cash equivalents, and restricted cash at end of the period		449,511	389,275
Scenario, Adjustment [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other investing activities		(3,164)	180
Net cash provided by (used in) investing activities		(3,164)	180
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash		34	43
Net increase in cash, cash equivalents, and restricted cash		(3,130)	223
Cash, cash equivalents, and restricted cash at beginning of year	$ 614	3,744	3,521
Cash, cash equivalents, and restricted cash at end of the period		$ 614	$ 3,744

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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