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Debt, Net - Convertible Notes (Details) - Convertible Notes	6 Months Ended
	Jun. 30, 2018 $ / shares	Jun. 30, 2017 USD ($)	Mar. 31, 2014 USD ($)	Jul. 31, 2013 USD ($)
2020 Convertible Notes
Debt Instrument [Line Items]
Debt issued | $				$ 172,500,000.0
Stated interest rate (as a percent)	3.00%			3.00%
Initial conversion price (USD per share)	$ 45.72
Closing stock price at date of issuance (in dollars per share)	$ 33.35
Conversion rate (shares per $1,000 principal amount)	21.8718
2021 Convertible Notes
Debt Instrument [Line Items]
Debt issued | $			$ 161,000,000.0
Stated interest rate (as a percent)	2.875%		2.875%
Initial conversion price (USD per share)	$ 59.39
Closing stock price at date of issuance (in dollars per share)	$ 47.51
Conversion rate (shares per $1,000 principal amount)	16.8386
2022 Convertible Notes
Debt Instrument [Line Items]
Debt issued | $		$ 150,000,000.0
Stated interest rate (as a percent)	3.25%	3.25%
Initial conversion price (USD per share)	$ 45.57
Closing stock price at date of issuance (in dollars per share)	$ 35.05
Conversion rate (shares per $1,000 principal amount)	21.9467

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