Earnings per share Earnings Per Share (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Weighted-Average Diluted Shares Outstanding
Weighted average common shares outstanding - basic	98,546	98,251	64,032
Diluted	100,154	98,251	64,032
Anti-dilutive Effect
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	144	1,936	1,291
Convertible Senior Note
Convertible Note, Number of Shares Convertible	2,300
1.125% Convertible Senior Notes due 2021 [Member]
Convertible Senior Note
Convertible Note, Conversion Price	$ 85.39
Restricted Stock [Member]
Reconciliation of Weighted-Average Diluted Shares Outstanding
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	1,596	0	0
Anti-dilutive Effect
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	28	1,707	989
Other Equity-Based Awards
Reconciliation of Weighted-Average Diluted Shares Outstanding
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	12	0	0
Anti-dilutive Effect
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	116	229	302