Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Attributable to Parent	$ 72,572,000	$ (37,707,000)	$ 46,869,000
Weighted Average Number of Shares Outstanding, Basic	19,515,000	19,301,000	19,103,000
Weighted Average Number of Shares Outstanding, Diluted	20,296,000	19,301,000	19,551,000
Earnings Per Share, Basic	$ 3.72	$ (1.95)	$ 2.45
Earnings Per Share, Diluted	$ 3.58	$ (1.95)	$ 2.40
Restricted Stock Units (RSUs) [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	587,000	0	285,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		472,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		472,000
Performance Shares [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	194,000	0	163,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		120,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		120,000