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Stock-Based Compensation - Performance-Based Stock Grants (Details)		12 Months Ended
	Sep. 23, 2020 shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based award vesting period		5 years
Weighted-Average Grant-Date Fair Value
Number of share to vest	0
Shares
Nonvested at the beginning of the period (in shares)		79,560	81,608	72,109	112,219
Granted (in shares)		117,279	149,496	112,502
Vested (in shares)		(119,327)	(108,610)	(131,260)
Forfeited or unearned (in shares)			(31,387)	(21,352)
Nonvested at the beginning of the period, weighted-average grant-date fair value (in usd per share) | $ / shares		$ 8.08	$ 8.35	$ 7.76	$ 7.89
Granted, weighted-average grant-date fair value (in usd per share) | $ / shares		8.34	9.38	7.81
Vested, weighted-average grant-date fair value (in usd per share) | $ / shares		$ 8.52	9.04	8.27
Forfeited or unearned, weighted-average grant-date fair value (in usd per share) | $ / shares			$ 9.55	$ 8.43
Minimum
Weighted-Average Grant-Date Fair Value
Percentage of number of share earned of target share granted	50
Maximum
Weighted-Average Grant-Date Fair Value
Percentage of number of share earned of target share granted	200
Shares Underlying Stock Options Excluded | Class A Non-Voting
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based award vesting period		3 years
Weighted-Average Grant-Date Fair Value
Stock option vesting per year (percent)		33.00%
Shares
Share-based compensation expense | $		$ 617,000	$ 1,397,000	$ 1,253,000
Unearned compensation cost | $		$ 636,000
2019 Replacement Awards
Weighted-Average Grant-Date Fair Value
Stock option vesting per year (percent)	50.00%
Vesting date	December 31, 2021
2019 Replacement Awards | Maximum
Weighted-Average Grant-Date Fair Value
Total shareholder return	10
2020 Replacement Awards
Weighted-Average Grant-Date Fair Value
Stock option vesting per year (percent)	100.00%
Vesting date	December 31, 2022
2020 Replacement Awards | Maximum
Weighted-Average Grant-Date Fair Value
Total shareholder return	20
Performance Stock Grants Excluded because Performance Conditions Have Not Been Met | Class A Non-Voting
Shares
Nonvested at the beginning of the period (in shares)		899,271	973,779	988,837	884,342
Granted (in shares)		1,616,902	626,776	751,128
Vested (in shares)		(224,681)	(214,824)	(445,311)
Forfeited or unearned (in shares)		(1,466,729)	(427,010)	(201,322)
Nonvested at the beginning of the period, weighted-average grant-date fair value (in usd per share) | $ / shares		$ 8.19	$ 8.38	$ 8.07	$ 7.05
Granted, weighted-average grant-date fair value (in usd per share) | $ / shares		8.01	8.87	7.43
Vested, weighted-average grant-date fair value (in usd per share) | $ / shares		8.33	8.49	5.98
Forfeited or unearned, weighted-average grant-date fair value (in usd per share) | $ / shares		$ 8.10	$ 8.34	$ 7.54
Fair value of performance shares vested | $		$ 1,871,000	$ 1,823,000	$ 2,662,000
Share-based compensation expense | $		2,382,000,000	$ 1,082,000,000	$ 3,307,000,000
Unearned compensation cost | $		$ 4,999,000,000

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