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Earnings Per Share - Antidilutive Securities (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total anti-dilutive securities	5,780	5,580	3,930
Convertible Debt \| Convertible Notes, due 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share
Debt instrument, conversion price (usd per share)	$ 58.725
Convertible Debt \| Convertible Notes, due 2024 \| Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share
Debt instrument, conversion price (usd per share)	$ 71.775
Share-based awards
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total anti-dilutive securities	220	400	560
Convertible note hedge and capped call transactions
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total anti-dilutive securities	380	0	0
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total anti-dilutive securities	5,180	5,180	3,370