Description of Business and Summary of Significant Accounting Policies - Adjustments for New Accounting Policies (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash provided by operating activities	$ (20,808)	$ 10,773
Cash provided by financing activities	274,614	153,928
Net change in cash, cash equivalents, and restricted cash	$ 248,278	154,693
Previously reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash provided by operating activities		10,551
Cash provided by financing activities		147,863
Net change in cash, cash equivalents, and restricted cash		148,406
Accounting Standards Update 2016-18 | Adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash provided by operating activities		222
Cash provided by financing activities		6,065
Net change in cash, cash equivalents, and restricted cash		$ 6,287