Supplementary Financial Data Supplementary Financial Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended			36 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017
Supplementary Financial Data [Abstract]
Revenue	$ 722,485	$ 567,842	$ 558,098	$ 437,857	$ 621,702	$ 476,423	$ 456,866	$ 406,980	$ 2,286,282	$ 1,961,971	$ 1,691,327
Gross margin	130,039	115,813	108,762	89,155	115,551	101,750	89,268	86,699
Net Income Available to Common Stockholders	$ 32,407	$ 29,282	$ 27,911	$ 18,063	$ 15,882	$ 18,852	$ 15,770	$ 15,664	$ 107,663	$ 66,168	$ 51,734
Earnings Per Share, Basic	$ 1.17	$ 1.03	$ 0.98	$ 0.64	$ 0.57	$ 0.74	$ 0.63	$ 0.63	$ 3.81	$ 2.57	$ 2.10
Earnings Per Share, Diluted	$ 1.15	$ 1.01	$ 0.96	$ 0.60	$ 0.53	$ 0.64	$ 0.55	$ 0.55	$ 3.70	$ 2.26	$ 1.84
Basic Weighted Average Shares Outstanding	27,774	28,469	28,571	28,124	27,736	25,581	24,990	24,738	28,234	25,769	24,666
Diluted Weighted Average Shares Outstanding	28,181	28,906	29,101	30,544	31,172	30,675	30,619	30,329	29,178	30,688	30,116
Purchase Accounting Adjustments	$ 598	$ 692	$ 2,961	$ 896					$ 5,147
Charges related to stucco-related claims	1,000						$ 8,500		0	$ 8,500	$ 19,409	$ 28,400
Total valuation adjustments and write-offs	$ 5,809				$ 7,681				$ 5,809	$ 7,681	$ 3,992