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Stock-Based Compensation - Summary of the Company's Service Based RSU Activity (Details) - RSUs - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of RSUs      
Outstanding at the beginning of the period 400,000 500,000 500,000
Granted 200,000 100,000 100,000
Issued (100,000) (200,000) (100,000)
Outstanding at the end of the period 543,391 400,000 500,000
Weighted-Average Grant Date Fair Value      
Outstanding at the beginning of the period $ 48.06 $ 41.65 $ 36.75
Granted 51.51 68.85 66.63
Issued 51.82 44.75 41.46
Outstanding at the end of the period $ 47.98 $ 48.06 $ 41.65