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Liabilities - Convertible Senior Notes (Details) - Convertible Notes - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 10, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Debt
Principal amount	$ 345,000	$ 345,000		$ 345,000		$ 345,000
Interest rate (as a percent)	2.70%
Proceeds received, net of transaction fees	$ 335,800
Unamortized debt discount		(46,686)		(46,686)		(52,336)
Unamortized transaction costs		(4,703)		(4,703)		(5,272)
Net carrying value		293,611		293,611		$ 287,392
Cash Interest Expense
Coupon interest expense		2,329	$ 2,329	4,658	$ 4,658
Non-Cash Interest Expense
Amortization of debt discount		2,851	2,646	5,650	5,243
Amortization of transaction costs		287	266	569	528
Total Interest Expense		5,467	$ 5,241	10,877	$ 10,429
Estimated fair value		$ 305,300		$ 305,300
Convertible Debt, Fair Value by Fair Value Hierarchy Level [Extensible List]		Fair Value Inputs Level2 [Member]		Fair Value Inputs Level2 [Member]

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