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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Anti-dilutive shares that were excluded from the calculation of diluted earnings per share (in shares)									19,951	20,441	18,892
Earnings per share numerator:
Net income attributable to common shareholders before allocation of earnings to participating securities	$ 66,884	$ 95,794	$ 22,349	$ 85,541	$ 50,102	$ 67,805	$ 74,174	$ 62,205	$ 270,568	$ 254,286	$ 234,734
Earnings allocated to participating securities									448	441	474
Net income attributable to common shareholders after allocation of earnings to participating securities									$ 270,120	$ 253,845	$ 234,260
Earnings per share denominator:
Weighted-average number of shares of common stock outstanding - basic and diluted									10,961,000	11,166,000	11,515,000
Earnings per share - basic and diluted	$ 6.12	$ 8.77	$ 2.05	$ 7.67	$ 4.48	$ 6.06	$ 6.63	$ 5.57	$ 24.64	$ 22.73	$ 20.34

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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