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Stock-Based Compensation - Non-Vested Restricted Stock Awards Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Shares (in 000’s)      
Non-vested at beginning of period (in shares) 162 153 225
Granted (in shares) 167 133 77
Vested (in shares) (109) (119) (146)
Forfeited (in shares) (16) (5) (3)
Non-vested at end of period (in shares) 204 162 153
Weighted-Average Grant Date Fair Value      
Non-vested at beginning of the year (in dollars per share) $ 61.19 $ 57.43 $ 51.31
Granted (in dollars per share) 42.65 64.14 63.30
Vested (in dollars per share) 56.16 59.67 51.10
Forfeited (in dollars per share) 54.16 60.11 60.17
Non-vested at end of the year (in dollars per share) $ 49.23 $ 61.19 $ 57.43