XML 28 R68.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Stockholders' Equity (Schedule of Stock Awards) (Details) - Stock Awards - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Shares      
Balance at beginning of the period (in shares) 187,368 271,819 232,622
Issued (in shares)   5,641  
Granted (in shares) 48,995 111,246 103,382
Dividend equivalents (in shares) 3,658 6,280 5,249
Forfeited (in shares) (8,459) (71,618)  
Vested (in shares) (102,434) (136,000) (69,434)
Balance at end of the period (in shares) 129,128 187,368 271,819
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Outstanding exercise price (in usd per share) $ 91.39 $ 70.29 $ 55.60
Issued (in usd per share)   106.10  
Granted (in usd per share) 78.11 106.10 90.36
Dividend equivalents (in usd per share) 67.03 90.47 104.93
Forfeited (in usd per share) 106.10 86.65  
Vested (in usd per share) 77.93 64.32 51.20
Outstanding exercise price (in usd per share) $ 96.21 $ 91.39 $ 70.29