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Stock Based Compensation - Summary of Stock Option Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]      
Awarded share Outstanding ending balance 909,828    
Performance Stock Plan      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]      
Weighted-average grant date fair value Outstanding beginning balance $ 5.00 $ 5.03 $ 5.16
Weighted-average grant date fair value Vested 6.06 5.29 5.53
Weighted-average grant date fair value Forfeited 5.03 4.74 4.92
Weighted-average grant date fair value Outstanding ending balance $ 4.86 $ 5.00 $ 5.03
Granted Share Outstanding Beginning Balance 1,051,292 1,196,092 1,694,476
Granted Share Vested (119,072) (115,040) (453,860)
Granted Share Forfeited (22,392) (29,760) (44,524)
Granted Share Outstanding Ending Balance 909,828 1,051,292 1,196,092
Awarded share Outstanding beginning balance 1,051,292 1,196,092 1,694,476
Awarded share Vested (119,072) (115,040) (453,860)
Awarded share Forfeited (22,392) (29,760) (44,524)
Awarded share Outstanding ending balance 909,828 1,051,292 1,196,092
2010 SIP and 2019 SIP      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]      
Weighted-average grant date fair value Outstanding beginning balance $ 18.10 $ 16.69 $ 15.58
Weighted-average grant date fair value Granted 46.58 28.53 22.87
Weighted-average grant date fair value Awarded 19.71 17.26 15.89
Weighted-average grant date fair value Vested 15.97 14.29 14.09
Weighted-average grant date fair value Forfeited 20.75 19.09 16.37
Weighted-average grant date fair value Outstanding ending balance $ 19.89 $ 18.10 $ 16.69
Granted Share Outstanding Beginning Balance 11,641,918 11,102,375 12,821,990
Granted Share Granted 970,997 1,812,047 1,577,721
Granted Share Awarded 497,082 299,339  
Granted Share Vested (3,059,619) (1,068,211) (933,916)
Granted Share Forfeited (356,041) (503,632) (2,363,420)
Granted Share Outstanding Ending Balance 9,694,337 11,641,918 11,102,375
Awarded share Outstanding beginning balance 8,070,576 6,595,319 4,809,604
Awarded shares Granted 148,015 797,778 454,313
Awarded share Awarded 1,880,512 1,954,983 2,489,905
Awarded share Vested (3,059,619) (1,068,211) (933,916)
Awarded share Forfeited (119,637) (209,293) (224,587)
Awarded share Outstanding ending balance 6,919,847 8,070,576 6,595,319
Shares not yet awarded Outstanding beginning balance 3,571,342 4,507,056 8,012,386
Shares not yet awarded Granted 822,982 1,014,269 1,123,408
Shares not yet awarded Awarded (1,383,430) (1,655,644) (2,489,905)
Shares not yet awarded Forfeited (236,404) (294,339) (2,138,833)
Shares not yet awarded Outstanding ending balance 2,774,490 3,571,342 4,507,056