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Stock-Based Compensation - TSR Unit Activity (Details) - Total shareholder return restricted share units - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Shares    
Outstanding at beginning of period (in shares) 224  
Granted (in shares) 231  
Forfeited (in shares) (57)  
Outstanding at end of period (in shares) 398 224
Weighted Average Fair Value    
Outstanding at beginning of the period (in dollars per share) $ 38.60  
Granted (in dollars per share) 42.24 $ 38.64
Forfeited (in dollars per share) 42.02  
Outstanding at beginning of the period (in dollars per share) $ 40.22 $ 38.60