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Long Term Retention Plan ("LTRP") (Long Term Retention Plans Accrued Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
LTRP 2009 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Long term retention plan $ 33 $ (12)
LTRP 2010 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Long term retention plan 62 120
LTRP 2011 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Long term retention plan 96 142
LTRP 2012 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Long term retention plan 130 185
LTRP 2013 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Long term retention plan 413 842
LTRP 2014 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Long term retention plan 505 $ 1,059
LTRP 2015 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Long term retention plan $ 893