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Supplemental Cash Flows (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Supplemental cash flow disclosures |  |
Series A Common and Common Shares, dividends per share paid | $ 5.75 |
Series A Common and Common Shares, dividends paid | $ 482,270 |
Dividend payable date | Jun. 25, 2013 |
Supplemental cash flows, stock based compensation |  |
Net cash receipts (disbursements) from exercise of stock options and vesting of other stock awards | (2,206) | (2,465)
Common Shares |  |
Supplemental cash flows, stock based compensation |  |
Shares withheld | 133 | 78
Aggregate value of shares withheld | 4,782 | 3,076
Cash receipts upon exercise of stock options | 1,039 | 627
Cash disbursements for payments of taxes | (3,245) | (3,092)
Net cash receipts (disbursements) from exercise of stock options and vesting of other stock awards | $ (2,206) | $ (2,465)

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