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Stock-Based Compensation Phantom Stock Units Summary (Details) - Phantom Share Units (PSUs) [Member] - $ / shares
shares in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 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) 12 31
Granted, weighted average grant date fair value (in dollars per share) $ 49.39 $ 69.30
Released (in shares) (35) (27)
Released, weighted average grant date fair value (in dollars per share) $ 55.99  
Forfeited (in shares) (2) (1)
Forfeited, weighted average grant date fair value (in dollars per share) $ 63.88  
Outstanding, ending balance (in shares) 58 87
Outstanding, ending balance, weighted average grant date fair value (in dollars per share) $ 62.56  
Expected to Vest [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding, ending balance (in shares) 58 85