Convertible Senior Notes - Schedule of Conversion (Details) shares in Thousands	1 Months Ended	2 Months Ended
	Nov. 30, 2013 shares $ / shares	Jun. 30, 2017 shares $ / shares
2022 Notes
Debt Instrument [Line Items]
Initial Conversion Price per Share (in USD per share) | $ / shares		$ 134.75
Initial Conversion Rate per $1,000 Par Value (in USD per share)		0.00742
Initial Number of Shares (in shares) | shares		5,807
2018 Notes
Debt Instrument [Line Items]
Initial Conversion Price per Share (in USD per share) | $ / shares	$ 73.88
Initial Conversion Rate per $1,000 Par Value (in USD per share)	0.01354
Initial Number of Shares (in shares) | shares	7,783