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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, 2015 | Jun. 30, 2014 | [2] | Jun. 30, 2015 | Jun. 30, 2014 | [2]
Long Term Retention Plan 2009 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Long term retention plan | [1] | $ 320 | $ (88) | $ 308 | $ (439)
Long Term Retention Plan 2010 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Long term retention plan | [1] | 392 | (8) | 511 | (191)
Long Term Retention Plan 2011 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Long term retention plan | [1] | 445 | 44 | 587 | (57)
Long Term Retention Plan 2012 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Long term retention plan | [1] | 522 | 91 | 707 | 90
Long Term Retention Plan 2013 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Long term retention plan | [1] | 1,196 | 435 | 2,038 | 1,039
Long Term Retention Plan 2014 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Long term retention plan | [1] | $ 1,067 | $ 691 | $ 2,126 | $ 1,489
[1] | (Gain) / Loss
[2] | For the six and three-month periods ended June 30, 2014, the table above shows a reduction of compensation costs for LTRP 2009, 2010 and 2011 as a consequence of a decrease in the Company's stock price during the quarter.

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