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Debt 0.75% Senior convertible notes due 2022 Narrative (Details)		3 Months Ended		6 Months Ended
	May 13, 2017	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) d	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Jun. 12, 2017 USD ($)	May 12, 2017 USD ($) $ / shares
Debt Instrument [Line Items]
Aggregate principal amount		$ 400,000,000		$ 400,000,000		$ 400,000,000
Proceeds from Convertible Debt				$ 0	$ 389,000,000
Current Fiscal Year End Date				--12-31
Non-cash interest expense				$ 7,500,000	2,100,000
0.75% Senior Convertible Notes | Convertible Notes due 2022
Debt Instrument [Line Items]
Initial conversion rate adjustment, shares	0.0100918
Senior Notes [Member] | 0.75% Senior Convertible Notes | Convertible Notes due 2022
Debt Instrument [Line Items]
Aggregate principal amount							$ 50,000,000	$ 350,000,000.0
Interest rate on convertible notes								0.75%
Proceeds from Convertible Debt			$ 389,000,000
Initial conversion price of convertible notes (in dollars per share) | $ / shares								$ 99.09
Contractual coupon interest rate		700,000	400,000	1,500,000	400,000
Non-cash interest expense		3,300,000	1,800,000	6,600,000	1,800,000
Amortization of debt issuance costs		$ 400,000	200,000	$ 800,000	$ 200,000
Effective interest rate		5.14%		5.14%
Conversion price in event of fundamental change		100.00%		100.00%
Conversion multiple		$ 1,000		$ 1,000
Debt Instrument, Redemption Price, Percentage				100.00%
Senior Notes [Member] | Additional Paid-in Capital | 0.75% Senior Convertible Notes | Convertible Notes due 2022
Debt Instrument [Line Items]
Amount reclassified to stockholders' equity			$ 72,600,000
Senior Notes [Member] | Debt Instrument Conversion Term One | Minimum | 0.75% Senior Convertible Notes | Convertible Notes due 2022
Debt Instrument [Line Items]
Threshold consecutive trading days | d				20
Threshold percentage of stock price trigger				130.00%
Senior Notes [Member] | Debt Instrument Conversion Term One | Maximum | 0.75% Senior Convertible Notes | Convertible Notes due 2022
Debt Instrument [Line Items]
Threshold consecutive trading days | d				30
Senior Notes [Member] | Debt Instrument Conversion Term Two | 0.75% Senior Convertible Notes | Convertible Notes due 2022
Debt Instrument [Line Items]
Threshold consecutive trading days | d				5
Senior Notes [Member] | Debt Instrument Conversion Term Two | Maximum | 0.75% Senior Convertible Notes | Convertible Notes due 2022
Debt Instrument [Line Items]
Threshold consecutive trading days | d				5
Threshold percentage of stock price trigger				98.00%

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