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Stockholders' Equity - Restricted Stock Activity (Details) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Shares      
Outstanding at beginning of period (shares) 206,202 147,259 132,273
Granted (shares) 167,292 111,306 118,498
Vested (shares) (98,501) (52,363) (102,846)
Forfeited (shares) (10,850) 0 (666)
Outstanding at end of period (shares) 264,143 206,202 147,259
Weighted-Average Grant Date Fair Value      
Outstanding at beginning of period (USD per share) $ 106.88 $ 125.11 $ 130.63
Granted (USD per share) 169.63 89.73 115.90
Vested (USD per share) 125.59 121.69 121.55
Forfeited (USD per share) 141.85 0 134.36
Outstanding at end of period (USD per share) $ 138.21 $ 106.88 $ 125.11