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Restricted Stock Units (Summary of Restricted Stock Units Issued) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]    
Share based compensation expense $ 26,000 $ 30,000
Restricted stock    
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]    
Restricted stock units (in units) 757,294 855,051
Fair Value $ 57,796 $ 58,712
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