Stockholders' Equity (Details) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018 $ / shares	Dec. 31, 2019 USD ($) Vote $ / shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares
Common Stock [Member]
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock dividend paid in cash (in dollars per share) | $ / shares	$ 1.00
Total dividends paid on common Stock | $		$ 13,913	$ 32,595	$ 10,473
Class A Common Stock [Member]
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Percentage of number of directors elected under stock voting right		75.00%
Number of votes per share | Vote		10
Conversion basis		1-for-1 basis
Common stock dividend paid in cash (in dollars per share) | $ / shares	$ 0.95	$ 0.72	$ 1.63	$ 0.51
Total dividends paid on common Stock | $		$ 1,143	$ 2,869	$ 919
Class A Common Stock [Member] | Minimum [Member]
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferential dividend rate of common stock of dividends paid		105.00%