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Equity - Activity for Class B Common Stock and Treasury Stock (Details) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Class B Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of Treasury Stock	61,000
Common Stock | Class B Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	100,803,382	101,100,453
Stock Award Activity	498,324	454,769
Purchase of Treasury Stock	60,833	118,645
Ending Balance	101,240,873	101,436,577
Treasury Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	8,702,074	8,405,003
Stock Award Activity	498,324	454,769
Purchase of Treasury Stock	60,833	118,645
Ending Balance	8,264,583	8,068,879

X

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-Topic 505
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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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-Publisher FASB
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-Topic 505
-SubTopic 10
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