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Stock-Based Compensation Phantom Stock Units Summary (Details) - Phantom Share Units (PSUs) [Member] - $ / shares
shares in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding, beginning balance (in shares) 83 63
Outstanding, beginning balance, weighted average grant date fair value (in dollars per share) $ 61.80  
Converted upon acquisition (in shares)   21
Granted (in shares) 13 32
Granted, weighted average grant date fair value (in dollars per share) $ 50.33 $ 69.22
Released (in shares) (37) (32)
Released, weighted average grant date fair value (in dollars per share) $ 56.37  
Forfeited (in shares) (4) (3)
Forfeited, weighted average grant date fair value (in dollars per share) $ 65.18  
Outstanding, ending balance (in shares) 55 81
Outstanding, ending balance, weighted average grant date fair value (in dollars per share) $ 62.40  
Expected to Vest [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding, ending balance (in shares) 55 81