Earnings per share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net Income	$ 132,270	$ 48,346	$ 238,041	$ 202,280
Net (income) loss attributable to redeemable noncontrolling interest	(51)	0	433	0
Accretion of redeemable noncontrolling interest (see Note 11)	(280)	0	(653)	0
Adjustment of redeemable noncontrolling interest to redemption value	51	0	(433)	0
Earnings available to common shareholders	$ 131,990	$ 48,346	$ 237,388	$ 202,280
Weighted average number of common shares outstanding - basic (in shares)	219,579	217,315	218,997	217,040
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted average number of common shares outstanding - diluted (in shares)	219,977	218,310	219,423	217,808
Net income per share – basic (in dollars per share)	$ 0.60	$ 0.22	$ 1.08	$ 0.93
Net income per share – diluted (in dollars per share)	$ 0.60	$ 0.22	$ 1.08	$ 0.93
Restricted stock units
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive securities (in shares)	180	607	163	420
Performance shares
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive securities (in shares)	216	364	262	312
Stock options
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive securities (in shares)	2	24	1	36