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Restricted Stock Units (Summary of Restricted Stock Units Issued) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]    
Share based compensation expense $ 11,000 $ 9,000
Restricted Stock [Member]    
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]    
Restricted Stock Units 1,853 5,580,000
Restricted Stock Units, Fair Value $ 129 $ 286
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