Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Schedule of Cash Payments and Compensation Costs (Details)

v3.10.0.1
Share-Based Compensation - Schedule of Cash Payments and Compensation Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Compensation expense $ 10,700 $ 22,700 $ 16,200
Employee Phantom Stock Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Cash payments for settled shares 2,360 3,066 2,442
Compensation expense 5,283 16,910 12,694
Director Phantom Stock Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Cash payments for settled shares 198 474 278
Compensation expense $ 491 $ 2,588 $ 2,098