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Stock-Based Compensation - Phantom Stock Units Summary (Details) - Phantom Share Units (PSUs) [Member] - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Outstanding, beginning balance (in shares) 63 62
Converted upon acquisition (in shares) 21  
Granted (in shares) 41 32
Issued (in shares) (35) (20)
Forfeited, Number (7) (11)
Outstanding, ending balance (in shares) 83 63
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Outstanding, beginning balance (in dollars per share) $ 62.53  
Shares converted upon acquisition (in dollars per share) 69.40  
Granted (in dollars per share) 66.67 $ 65.55
Released (in dollars per share) 54.33  
Forfeitures (in dollars per share) 61.28  
Outstanding, ending balance (in dollars per share) $ 61.80 $ 62.53
Expected to Vest [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Outstanding, beginning balance (in shares) 63  
Outstanding, ending balance (in shares) 83 63