| Balance | |
| Balance (in shares) | |
| Net income | 498.39K |
| Foreign currency translation adjustment | |
| Cash dividends paid | |
| Unrealized investment gain, net | |
| Conversion of common stock - B to A | |
| Conversion of common stock - B to A (in shares) | |
| Repurchase of Class A common stock | |
| Repurchase of Class A common stock (in shares) | |
| Issuance of stock under stock award plan | |
| Issuance of stock under stock award plan (in shares) | |
| Share-based compensation expense | |
| Tax impact of share based compensation | |
| Sale of subsidiary shares to noncontrolling interests | |
| Issuance of shares to noncontrolling interests | |
| Distributions to noncontrolling interests | |
| Purchase of additional noncontrolling interests | |
| Purchase of additional noncontrolling interests (in shares) | |
| Balance | |
| Balance (in shares) | |
| Other (in shares) | |