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Long Term Retention Plan (Long Term Retention Plans Accrued Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan $ 18,767 $ 1,055 $ 32,208 $ 16,792
LTRP 2010 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan   (29)   24
LTRP 2011 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan (29) (175) 26 487
LTRP 2012 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan 857 (326) 1,416 799
LTRP 2013 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan (96) (327) 97 1,422
LTRP 2014 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan 1,603 (372) 2,823 1,712
LTRP 2015 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan 2,880 (499) 4,862 2,317
LTRP 2016 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan 4,569 (492) 7,607 3,416
LTRP 2017 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan 4,163 173 6,976 3,513
LTRP 2018 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan 1,868 $ 3,102 3,323 $ 3,102
LTRP 2019 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan $ 2,952   $ 5,078