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Share-based awards (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Settlement of share-based awards upon change in control $ 75,311 $ 0
Share-based Compensation Expense $ 36,200  
Outstanding at January 1, 2016 267,918  
Exercised prior to March 18, 2016 15,997  
Settled in cash by the Company upon change in control (251,921)  
Outstanding at March 31, 2016 0  
Stock Appreciation Rights (SSARs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding at January 1, 2016 991,724  
Exercised prior to March 18, 2016 (12,294)  
Awards settled upon change in control (979,430)  
Outstanding at March 31, 2016 0  
Share Options and SSARs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Settlement of share-based awards upon change in control $ 75,300  
RSUAndPSU    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding at January 1, 2016 861,608  
Awards settled upon change in control (667,511)  
Performance based adjustment 76,889  
Vested prior to March 18, 2016 (270,986)  
Outstanding at March 31, 2016 0  
Warrants    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercised prior to March 18, 2016 371  
Settled in cash by the Company upon change in control 186  
Outstanding at March 31, 2016 0