Label	Element	Value
Treasury Stock [Member]
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityCumulativeEffectOfChangeInAccountingPrinciple	$ 0
AOCI Attributable to Parent [Member]
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityCumulativeEffectOfChangeInAccountingPrinciple	0
Cumulative Effect, Period of Adoption, Adjustment [Member]
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityCumulativeEffectOfChangeInAccountingPrinciple	(395,000)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityCumulativeEffectOfChangeInAccountingPrinciple	(395,000)
Common Class B [Member] | Common Stock [Member]
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityCumulativeEffectOfChangeInAccountingPrinciple	0
Common Class A [Member] | Common Stock [Member]
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityCumulativeEffectOfChangeInAccountingPrinciple	$ 0