Stock-Based Compensation - Stock Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock option activity
Total options outstanding, end of period (in shares)	8,969,886
Weighted-Average Exercise Price
Total options outstanding at the end of the period (in dollars per share)	$ 40.34
2019 LTIP
Stock option activity
Total options outstanding, end of period (in shares)	4,296,000
Weighted-Average Exercise Price
Total options outstanding at the end of the period (in dollars per share)	$ 35.42
Stock options
Stock option activity
Total options outstanding, beginning of period (in shares)	8,847,734	7,923,009	6,845,685
Granted (in shares)	7,494,012	3,468,626	1,901,000
Exercised (in shares)	(267,905)	(514,401)	(431,092)
Forfeited and cancelled (in shares)	(1,871,802)	(2,029,500)	(392,584)
Total options outstanding, end of period (in shares)	14,202,039	8,847,734	7,923,009
Exercisable at the end of the period (in shares)	1,781,153	1,772,608	1,892,809
Weighted-Average Exercise Price
Total options outstanding, beginning of the period (in dollars per share)	$ 43.90	$ 36.21	$ 31.13
Granted (in dollars per share)	38.41	59.66	54.41
Exercised (in dollars per share)	16.43	28.70	23.36
Forfeited and cancelled (in dollars per share)	39.67	44.64	50.03
Total options outstanding at the end of the period (in dollars per share)	42.08	43.90	36.21
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 41.41	$ 35.13	$ 29.97
Share-based compensation additional disclosures
Tax benefit from stock awards exercised	$ 1,664	$ 9,347	$ 5,006
Additional disclosures
Aggregate intrinsic value of stock options outstanding	6,511
Aggregate intrinsic value of stock options exercisable	$ 757
Stock options \| 2019 LTIP
Stock option activity
Total options outstanding, beginning of period (in shares)	5,490,626	4,312,000
Total options outstanding, end of period (in shares)	8,969,886	5,490,626	4,312,000
Weighted-Average Exercise Price
Total options outstanding, beginning of the period (in dollars per share)	$ 42.81	$ 31.39
Total options outstanding at the end of the period (in dollars per share)	$ 40.34	$ 42.81	$ 31.39

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Number of share options (or share units) exercised during the current period.

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