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Stock Based Compensation - Summary of Stock Option Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]      
Awarded share Outstanding ending balance 1,051,292    
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 $ 5.03 $ 5.16 $ 5.11
Weighted-average grant date fair value Vested 5.29 5.53 4.81
Weighted-average grant date fair value Forfeited 4.74 4.92 5.24
Weighted-average grant date fair value Outstanding ending balance $ 5.00 $ 5.03 $ 5.16
Granted Share Outstanding Beginning Balance 1,196,092 1,694,476 2,006,550
Granted Share Vested (115,040) (453,860) (277,602)
Granted Share Forfeited (29,760) (44,524) (34,472)
Granted Share Outstanding Ending Balance 1,051,292 1,196,092 1,694,476
Awarded share Outstanding beginning balance 1,196,092 1,694,476 2,006,550
Awarded share Vested (115,040) (453,860) (277,602)
Awarded share Forfeited (29,760) (44,524) (34,472)
Awarded share Outstanding ending balance 1,051,292 1,196,092 1,694,476
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 $ 16.69 $ 15.58 $ 14.98
Weighted-average grant date fair value Granted 28.53 22.87 20.82
Weighted-average grant date fair value Awarded 17.26 15.89 15.72
Weighted-average grant date fair value Vested 14.29 14.09 12.61
Weighted-average grant date fair value Forfeited 19.09 16.37 14.89
Weighted-average grant date fair value Outstanding ending balance $ 18.10 $ 16.69 $ 15.58
Granted Share Outstanding Beginning Balance 11,102,375 12,821,990 12,256,112
Granted Share Granted 1,812,047 1,577,721 1,392,912
Granted Share Awarded 299,339    
Granted Share Vested (1,068,211) (933,916) (484,914)
Granted Share Forfeited (503,632) (2,363,420) (342,120)
Granted Share Outstanding Ending Balance 11,641,918 11,102,375 12,821,990
Awarded share Outstanding beginning balance 6,595,319 4,809,604 4,802,588
Awarded shares Granted 797,778 454,313 241,334
Awarded share Awarded 1,954,983 2,489,905 326,808
Awarded share Vested (1,068,211) (933,916) (484,914)
Awarded share Forfeited (209,293) (224,587) (76,212)
Awarded share Outstanding ending balance 8,070,576 6,595,319 4,809,604
Shares not yet awarded Outstanding beginning balance 4,507,056 8,012,386 7,453,524
Shares not yet awarded Granted 1,014,269 1,123,408 1,151,578
Shares not yet awarded Awarded (1,655,644) (2,489,905) (326,808)
Shares not yet awarded Forfeited (294,339) (2,138,833) (265,908)
Shares not yet awarded Outstanding ending balance 3,571,342 4,507,056 8,012,386