Description of Business and Summary of Significant Accounting Policies - Adjustments for New Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating activities	$ (20,492)	$ (21,814)
Financing activities	12,036	3,623
Net change in cash, cash equivalents, and restricted cash (1)	$ (10,761)	(22,973)
Previously reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating activities		(22,011)
Financing activities		(1,028)
Net change in cash, cash equivalents, and restricted cash (1)		(27,821)
Accounting Standards Update 2016-18 | Adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating activities		197
Financing activities		4,651
Net change in cash, cash equivalents, and restricted cash (1)		$ (4,848)