EMPLOYEE BENEFIT PLANS - Restricted Stock Activity (Details) - Restricted Stock - $ / shares shares in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Shares | |||
| Nonvested restricted stock, beginning balance (in shares) | 964 | ||
| Granted (in shares) | 503 | ||
| Vested (in shares) | (421) | ||
| Forfeited (in shares) | (70) | ||
| Nonvested restricted stock, ending balance (in shares) | 976 | 964 | |
| Weighted- Average Grant-Date Fair Value | |||
| Nonvested restricted stock, beginning balance (in USD per share) | $ 213.99 | ||
| Granted (in USD per share) | 302.09 | $ 276.62 | $ 222.35 |
| Vested (in USD per share) | 239.42 | ||
| Forfeited (in USD per share) | 269.06 | ||
| Nonvested restricted stock, ending balance (in USD per share) | $ 245.21 | $ 213.99 | |