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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 |

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