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Stock-Based Compensation Phantom Stock Units Summary (Details) - Phantom Share Units (PSUs) [Member] - $ / shares
shares in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding, beginning balance (in shares) 63 62
Outstanding, beginning balance, weighted average grant date fair value (in dollars per share) $ 51.88  
Converted upon acquisition (in shares) 21  
Converted upon acquisition, weighted average grant date fair value (in dollars per share) $ 69.40  
Granted (in shares) 37 32
Granted, weighted average grant date fair value (in dollars per share) $ 68.06 $ 65.55
Released (in shares) (34) (20)
Released, weighted average grant date fair value (in dollars per share) $ 53.55  
Forfeited (in shares) (3) (7)
Forfeited, weighted average grant date fair value (in dollars per share) $ 56.47  
Outstanding, ending balance (in shares) 84 67
Outstanding, ending balance, weighted average grant date fair value (in dollars per share) $ 62.53  
Expected to Vest [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding, ending balance (in shares) 84 67