Investment in Unconsolidated Entities (Summary of Financial Information of Investment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Company’s share in net earnings of unconsolidated entities	$ 4,593	$ 5,174	$ 8,484	$ 7,739
Assets	1,287,136		1,287,136			$ 988,847
Liabilities	537,930		537,930			325,895
Stockholders' Equity Attributable to Parent	717,389	575,759	717,389	575,759	$ 666,131	640,242	$ 542,982	$ 523,168
Stockholders' Equity Attributable to Noncontrolling Interest	14,302	8,186	14,302	8,186	10,630	9,167	10,900	13,227
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	731,691	583,945	731,691	583,945	676,761	649,409	553,882	536,395
Liabilities and Equity	1,287,136		1,287,136			988,847
Total revenues	373,806	232,833	608,285	446,100
Net income	58,283	34,837	86,044	51,553
Cash		43,162		43,162				33,269
Schedule of Equity Method Investments [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	14,302	8,186	14,302	8,186	10,630	9,167	10,900	13,227
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	731,691	583,945	731,691	583,945	676,761	649,409	553,882	536,395
Total revenues	373,806	232,833	608,285	446,100
Net income	58,283	34,837	86,044	51,553
Equity in income of unconsolidated entities	4,593	5,174	8,484	7,739
Assets	1,287,136		1,287,136			988,847
Cash		43,162		43,162				33,269
Liabilities	537,930		537,930			325,895
Stockholders' Equity Attributable to Parent	717,389	575,759	717,389	575,759	$ 666,131	640,242	$ 542,982	$ 523,168
Liabilities and Equity	1,287,136		1,287,136			988,847
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Income Statement [Abstract]
Company’s share in net earnings of unconsolidated entities	4,593	5,174	8,484	7,739
Assets	216,316		216,316			166,248
Liabilities	123,196		123,196			78,961
Stockholders' Equity Attributable to Parent	47,652		47,652			43,451
Stockholders' Equity Attributable to Noncontrolling Interest	45,468		45,468			43,836
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	93,120		93,120			87,287
Liabilities and Equity	216,316		216,316			166,248
Total revenues	51,737	52,948	91,458	88,313
Net income	9,245	10,611	17,099	16,161
Cash	14,131		14,131			12,765
Schedule of Equity Method Investments [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	45,468		45,468			43,836
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	93,120		93,120			87,287
Total revenues	51,737	52,948	91,458	88,313
Net income	9,245	10,611	17,099	16,161
Equity in income of unconsolidated entities	4,593	5,174	8,484	7,739
Accounts and Other Receivables, Net, Current	2,558		2,558			1,815
Financing Receivable, after Allowance for Credit Loss	5,942		5,942			5,942
Financing Receivable, Held-for-Sale	35,756		35,756			14,530
Inventory, Net	150,154		150,154			122,819
Other Assets, Current	7,775		7,775			8,377
Accounts Payable, Current	7,578		7,578			7,171
Accrued Liabilities, Current	15,712		15,712			11,148
Notes Payable, Current	99,906		99,906			60,642
Costs and Expenses	42,492	$ 42,337	74,359	$ 72,152
Assets	216,316		216,316			166,248
Cash	14,131		14,131			12,765
Liabilities	123,196		123,196			78,961
Stockholders' Equity Attributable to Parent	47,652		47,652			43,451
Liabilities and Equity	$ 216,316		$ 216,316			$ 166,248