Investment in Unconsolidated Entities (Summary of Financial Information of Investment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Income Statement [Abstract]
Company’s share in net earnings of unconsolidated entities	$ 5,555	$ 5,299	$ 14,039	$ 13,038
Assets	1,347,316		1,347,316			$ 988,847
Liabilities	546,689		546,689			325,895
Stockholders' Equity Attributable to Parent	766,789	610,079	766,789	610,079	$ 717,389	640,242	$ 575,759	$ 523,168
Stockholders' Equity Attributable to Noncontrolling Interest	16,432	8,820	16,432	8,820	14,302	9,167	8,186	13,227
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	783,221	618,899	783,221	618,899	731,691	649,409	583,945	536,395
Liabilities and Equity	1,347,316		1,347,316			988,847
Total revenues	342,340	275,821	950,625	721,921
Net income	51,260	35,954	137,304	87,507
Cash		40,269		40,269				33,269
Schedule of Equity Method Investments [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	16,432	8,820	16,432	8,820	14,302	9,167	8,186	13,227
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	783,221	618,899	783,221	618,899	731,691	649,409	583,945	536,395
Total revenues	342,340	275,821	950,625	721,921
Net income	51,260	35,954	137,304	87,507
Equity in income of unconsolidated entities	5,555	5,299	14,039	13,038
Assets	1,347,316		1,347,316			988,847
Cash		40,269		40,269				33,269
Liabilities	546,689		546,689			325,895
Stockholders' Equity Attributable to Parent	766,789	610,079	766,789	610,079	$ 717,389	640,242	$ 575,759	$ 523,168
Liabilities and Equity	1,347,316		1,347,316			988,847
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Income Statement [Abstract]
Company’s share in net earnings of unconsolidated entities	5,555	5,299	14,039	13,038
Assets	231,802		231,802			166,248
Liabilities	133,795		133,795			78,961
Stockholders' Equity Attributable to Parent	50,075		50,075			43,451
Stockholders' Equity Attributable to Noncontrolling Interest	47,932		47,932			43,836
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	98,007		98,007			87,287
Liabilities and Equity	231,802		231,802			166,248
Total revenues	64,131	50,068	155,589	138,381
Net income	11,214	10,880	28,313	27,041
Cash	14,852		14,852			12,765
Schedule of Equity Method Investments [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	47,932		47,932			43,836
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	98,007		98,007			87,287
Total revenues	64,131	50,068	155,589	138,381
Net income	11,214	10,880	28,313	27,041
Equity in income of unconsolidated entities	5,555	5,299	14,039	13,038
Accounts and Other Receivables, Net, Current	3,239		3,239			1,815
Financing Receivable, after Allowance for Credit Loss	5,942		5,942			5,942
Financing Receivable, Held-for-Sale	38,398		38,398			14,530
Inventory, Net	161,710		161,710			122,819
Other Assets, Current	7,661		7,661			8,377
Accounts Payable, Current	13,477		13,477			7,171
Accrued Liabilities, Current	15,992		15,992			11,148
Notes Payable, Current	104,326		104,326			60,642
Costs and Expenses	52,917	$ 39,188	127,276	$ 111,340
Assets	231,802		231,802			166,248
Cash	14,852		14,852			12,765
Liabilities	133,795		133,795			78,961
Stockholders' Equity Attributable to Parent	50,075		50,075			43,451
Liabilities and Equity	$ 231,802		$ 231,802			$ 166,248