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Restricted Stock Units (Summary of Restricted Stock Units Issued) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]    
Share based compensation expense $ 16,000 $ 15,000
Restricted Stock [Member]    
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]    
Restricted Stock Units 17,654 22,011,000
Restricted Stock Units, Fair Value $ 964 $ 1,102
Minimum [Member] | Restricted Stock [Member]    
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]    
Award vesting period 3 years  
Maximum [Member] | Restricted Stock [Member]    
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]    
Award vesting period 5 years