Share-based Compensation - Award Activity (Details)	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Restricted Stock Units (RSUs)
Restricted Stock Awards, Shares Activity
Outstanding at the beginning of the period (in shares) | shares	1,511,820
Granted (in shares) | shares	1,430,459
Forfeited/cancelled (in shares) | shares	(7,082)
Vested (in shares) | shares	(331,065)
Outstanding at the end of the period (in shares) | shares	2,604,132
Restricted Stock Awards, Weighted-average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 44.49
Granted (in usd per share)	24.93
Forfeited/canceled (in usd per share)	50.60
Vested (in usd per share)	46.10
Outstanding at the end of the period (in dollars per share)	$ 33.52
Restricted Stock Awards (RSAs)
Restricted Stock Awards, Shares Activity
Outstanding at the beginning of the period (in shares) | shares	888,305
Granted (in shares) | shares	54,040
Forfeited/cancelled (in shares) | shares	(4,786)
Vested (in shares) | shares	(357,810)
Outstanding at the end of the period (in shares) | shares	579,749
Restricted Stock Awards, Weighted-average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 40.67
Granted (in usd per share)	25.91
Forfeited/canceled (in usd per share)	39.62
Vested (in usd per share)	41.14
Outstanding at the end of the period (in dollars per share)	$ 38.71
Non-Vested Stock Options Outstanding
Non-Vested Stock Options Outstanding, Shares Activity
Beginning balance (in shares) | shares	120,809
Exercised (in shares) | shares	0
Forfeited/canceled (in shares) | shares	(3,173)
Expired (in shares) | shares	0
Vested (in shares) | shares	(55,568)
Ending balance (in shares) | shares	62,068
Non-Vested Stock Options Outstanding, Weighted-average Grant Date Fair Value
Beginning balance (in usd per share)	$ 39.63
Exercised (in usd per share)	0
Forfeited/canceled (in usd per share)	39.00
Expired (in usd per share)	0
Vested (in usd per share)	38.25
Ending balance (in usd per share)	$ 40.89
Stock Options Outstanding, Shares Activity
Vested (in shares) | shares	(55,568)
Stock Options Outstanding, Weighted-average Grant Date Fair Value
Forfeited/canceled (in usd per share)	$ 39.00
Expired (in usd per share)	0
Vested (in usd per share)	$ 38.25
Stock Options Outstanding
Non-Vested Stock Options Outstanding, Shares Activity
Vested (in shares) | shares	(55,568)
Non-Vested Stock Options Outstanding, Weighted-average Grant Date Fair Value
Exercised (in usd per share)	$ 22.03
Forfeited/canceled (in usd per share)	0
Expired (in usd per share)	34.27
Vested (in usd per share)	$ 38.25
Stock Options Outstanding, Shares Activity
Beginning balance (in shares) | shares	495,165
Forfeited/canceled (in shares) | shares	0
Expired (in shares) | shares	(36,202)
Vested (in shares) | shares	(55,568)
Ending balance (in shares) | shares	432,255
Stock Options Outstanding, Weighted-average Grant Date Fair Value
Beginning balance (in usd per share)	$ 29.48
Forfeited/canceled (in usd per share)	0
Expired (in usd per share)	34.27
Vested (in usd per share)	38.25
Ending balance (in usd per share)	$ 31.63
Exercisable/vested (in shares) | shares	432,255
Exercisable/vested (in usd per share)	$ 31.63
Stock options
Non-Vested Stock Options Outstanding, Shares Activity
Exercised (in shares) | shares	(82,276)