Shareholders' Equity - Narrative (Details) - USD ($)	5 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Nov. 21, 2019	Mar. 26, 2019	Dec. 31, 2018	Nov. 19, 2013
Class of Stock [Line Items]
Authorized repurchase amount			$ 50,000,000	$ 50,000,000
Shares repurchased and canceled (in shares)	1,732,392
Weighted average price (in dollars per share)	$ 28.86
Aggregate purchase price	$ 50,000,000	$ 50,252,000
Ordinary shares, shares outstanding (in shares)		44,676,132			46,134,381
Disproportionate tax effect		$ 14,600,000
Convertible Notes
Class of Stock [Line Items]
Debt instrument, fair value of embedded option		71,700,000				$ 71,700,000
Purchase of convertible hedges		72,600,000
Proceeds from Issuance of Warrants		40,500,000
Deferred financing cost allocated to equity		$ 1,600,000
Ordinary Shares
Class of Stock [Line Items]
Ordinary shares, shares outstanding (in shares)		44,676,132			46,134,381
Foreign Tax Authority
Class of Stock [Line Items]
Stamp taxes payable		$ 300,000