Reporting Segments (Schedule of Segment Reporting Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total revenue	$ 182,732	$ 91,961	$ 528,224	$ 221,484
Total income before income tax expense	15,945	6,697	39,900	19,943
Total assets	860,055		860,055		$ 675,979
Atlanta [Member]
Segment Reporting Information [Line Items]
Total revenue	61,175		188,075
Total income before income tax expense	4,195		13,999
Total assets	150,910		150,910		75,434
Central Texas [Member]
Segment Reporting Information [Line Items]
Total revenue	19,186	16,460	52,759	42,746
Total income before income tax expense	463	2,172	3,713	4,287
Total assets	114,239		114,239		85,083
Colorado [Member]
Segment Reporting Information [Line Items]
Total revenue	60,566	40,291	191,694	124,490
Total income before income tax expense	9,806	5,620	27,325	19,856
Total assets	306,642		306,642		280,361
Houston [Member]
Segment Reporting Information [Line Items]
Total revenue	9,354	7,365	26,844	7,365
Total income before income tax expense	(59)	(87)	(713)	(87)
Total assets	47,787		47,787		28,875
Nevada [Member]
Segment Reporting Information [Line Items]
Total revenue	32,451	27,845	68,852	46,883
Total income before income tax expense	5,108	2,731	9,878	5,412
Total assets	216,624		216,624		168,401
Corporate [Member]
Segment Reporting Information [Line Items]
Total income before income tax expense	(3,568)	$ (3,739)	(14,302)	$ (9,525)
Total assets	$ 23,853		$ 23,853		$ 37,825