Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Schedule of Phantom Stock Plans (Details)

v3.10.0.1
Share-Based Compensation - Schedule of Phantom Stock Plans (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Employee Phantom Stock Plan [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Total liability for share awards $ 50,233 $ 48,148
Director Phantom Stock Plan [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Total liability for share awards 7,000 8,436
Phantom Share Units (PSUs) [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Total liability for share awards $ 57,233 $ 56,584