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Restricted Stock Units (Summary of Restricted Stock Units Issued) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]    
Share based compensation expense $ 9,000 $ 11,000
Restricted stock    
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]    
Restricted stock units (in units) 4,174 1,853,000
Fair Value $ 290 $ 129
Minimum | Restricted stock    
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]    
Award vesting period 3 years  
Maximum | Restricted stock    
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]    
Award vesting period 5 years