Stock Based Compensation - Performance Stock Units Granted (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-Average Grant Date Fair Value - Granted (in dollars per share)	$ 43.12	$ 33.85	$ 29.51
Performance Shares | July 25, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Base period revenues	$ 1,975,000
Threshold goal, number of PSUs (in shares)	137,781
Threshold goal, home sale revenues	$ 2,074,000
Target goal, number of PSUs (in shares)	275,562
Target goal, home sale revenues	$ 2,173,000
Maximum goal, number of PSUs (in shares)	551,124
Maximum goal, home sale revenues	$ 2,370,000
Weighted-Average Grant Date Fair Value - Granted (in dollars per share)	$ 19.66
Maximum potential expense to be recognized	$ 10,834
Maximum Remaining Expense to be Recognized	0
Performance Shares | June 20, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Base period revenues	$ 2,426,000
Threshold goal, number of PSUs (in shares)	144,342
Threshold goal, home sale revenues	$ 2,547,000
Target goal, number of PSUs (in shares)	288,684
Target goal, home sale revenues	$ 2,669,000
Maximum goal, number of PSUs (in shares)	577,368
Maximum goal, home sale revenues	$ 2,911,000
Weighted-Average Grant Date Fair Value - Granted (in dollars per share)	$ 27.83
Maximum potential expense to be recognized	$ 16,070
Maximum Remaining Expense to be Recognized	0
Performance Shares | May 23, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Base period revenues	$ 2,543,000
Threshold goal, number of PSUs (in shares)	145,800
Threshold goal, home sale revenues	$ 2,670,000
Target goal, number of PSUs (in shares)	291,600
Target goal, home sale revenues	$ 2,797,000
Maximum goal, number of PSUs (in shares)	583,200
Maximum goal, home sale revenues	$ 3,052,000
Weighted-Average Grant Date Fair Value - Granted (in dollars per share)	$ 25.57
Maximum potential expense to be recognized	$ 14,915
Maximum Remaining Expense to be Recognized	1,307
Performance Shares | August 5, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Base period revenues	$ 2,982,000
Threshold goal, number of PSUs (in shares)	135,000
Threshold goal, home sale revenues	$ 3,131,000
Target goal, number of PSUs (in shares)	270,000
Target goal, home sale revenues	$ 3,280,000
Maximum goal, number of PSUs (in shares)	540,000
Maximum goal, home sale revenues	$ 3,578,000
Weighted-Average Grant Date Fair Value - Granted (in dollars per share)	$ 32.60
Maximum potential expense to be recognized	$ 17,604
Maximum Remaining Expense to be Recognized	7,340
Performance Shares | August 20, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Base period revenues	$ 3,205,000
Threshold goal, number of PSUs (in shares)	135,000
Threshold goal, home sale revenues	$ 3,366,000
Target goal, number of PSUs (in shares)	270,000
Target goal, home sale revenues	$ 3,526,000
Maximum goal, number of PSUs (in shares)	540,000
Maximum goal, home sale revenues	$ 3,846,000
Weighted-Average Grant Date Fair Value - Granted (in dollars per share)	$ 42.97
Maximum potential expense to be recognized	$ 23,205
Maximum Remaining Expense to be Recognized	$ 23,205