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Share Compensation Plans (Compensation Expense of Nonvested Shares) (Details)
$ in Thousands
Mar. 31, 2016
USD ($)
Nonvested time-based shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Remaining 2016 $ 1,655
2017 1,198
2018 577
Total 3,430
Nonvested performance-based shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Remaining 2016 1,737
2017 1,607
2018 771
Total $ 4,115