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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)

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

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- Definition

Cash outflow in the form of ordinary dividends to common shareholders, generally out of earnings.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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- Definition

The cash outflow paid by the company to cover an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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- Definition

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

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For net-share settlement of share-based awards when the employer withholds shares for the exercise price and income tax withholding obligations, this element represents the value of shares the employees use to repay the employer.

+ References

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