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Stockholders' Equity Statement of Stockholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (in shares)     49,411,016  
Beginning Balance $ 1,333,186 $ 1,483,328 $ 1,383,717 $ 1,503,738
Stock-based compensation plans $ 7,674 8,272 $ 23,889 20,624
Cancellation of shares (in shares) (73,000)   (73,000)  
Net loss $ (14,772) 32,118 $ (65,182) (11,946)
Other comprehensive income $ 24,704 (28,436) $ 9,007 (17,134)
Ending Balance (in shares) 49,402,628   49,402,628  
Ending Balance $ 1,350,792 $ 1,495,282 $ 1,350,792 $ 1,495,282
Accounting Standards Update [Extensible List]     us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201613Member
Cumulative Effect, Period of Adoption, Adjustment        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance     $ (639)  
Ordinary Shares        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (in shares) 49,476,000 49,380,000 49,411,000 49,323,000
Beginning Balance $ 76,338 $ 76,217 $ 76,257 $ 76,144
Stock-based compensation plans (in shares)   1,000 65,000 58,000
Stock-based compensation plans     $ 81 $ 73
Ending Balance (in shares) 49,403,000 49,381,000 49,403,000 49,381,000
Ending Balance $ 76,338 $ 76,217 $ 76,338 $ 76,217
Additional Paid-In Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 1,750,798 1,717,220 1,734,870 1,705,111
Stock-based compensation plans 7,670 8,262 23,598 20,371
Ending Balance 1,758,468 1,725,482 1,758,468 1,725,482
Treasury Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (1,057) (1,292) (1,263) (1,462)
Stock-based compensation plans 4 10 210 180
Ending Balance (1,053) (1,282) (1,053) (1,282)
Accumulated Other Comprehensive Loss        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (35,089) (13,174) (19,392) (24,476)
Other comprehensive income 24,704 (28,436) 9,007 (17,134)
Ending Balance (10,385) (41,610) (10,385) (41,610)
Accumulated Deficit        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (457,804) (295,643) (406,755) (251,579)
Net loss (14,772) 32,118 (65,182) (11,946)
Ending Balance $ (472,576) $ (263,525) (472,576) $ (263,525)
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance     $ (639)