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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract] |
Schedule of Fair Value of TSR Performance RSUs | We estimated the fair value of the TSR Performance RSUs referred to above on the date of the grant using a Monte Carlo simulation with the following assumptions:
Volatility of common stock |  |  | 27.85 | %
Expected dividend yield |  |  | 0.00 | %
Risk-free interest rate |  |  | 2.33 | %
Schedule of Non-Vested Stock Awards | A summary of the status of our non-vested stock awards is presented in the table below:
|  | Shares/Units |  |  | Weighted Average Market Value Per Share |
Balance at December 31, 2014 |  |  | 7,542,096 |  |  | $ | 22.53 |
Granted |  |  | 2,195,638 |  |  |  | 36.80 |
Vested |  |  | (2,033,263 | ) |  |  | 21.29 |
Forfeited |  |  | (237,406 | ) |  |  | 26.10 |
Balance at December 31, 2015 |  |  | 7,467,065 |  |  |  | 29.08 |
Granted |  |  | 1,496,408 |  |  |  | 29.24 |
Vested |  |  | (3,840,379 | ) |  |  | 25.09 |
Forfeited |  |  | (279,821 | ) |  |  | 28.62 |
Balance at December 31, 2016 |  |  | 4,843,273 |  |  |  | 31.66 |
Granted |  |  | 5,152,082 |  |  |  | 40.11 |
Vested |  |  | (2,020,812 | ) |  |  | 29.75 |
Forfeited |  |  | (297,441 | ) |  |  | 32.85 |
Balance at December 31, 2017 |  |  | 7,677,102 |  |  |  | 37.76 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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