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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 |

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