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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
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Supplementary Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product Liability Accrual, Component Amount | $ 19,400 | $ 14,500 | $ 2,800 | $ 2,200 | $ 500 |  |  |  | $ 19,400 | $ 500 |
Revenue | 523,246 | 442,464 | 401,247 | 324,370 | 468,923 | $ 363,457 | $ 322,856 | $ 263,159 | 1,691,327 | 1,418,395 | $ 1,215,180
Gross margin | 104,586 | 78,829 | 81,539 | 64,198 | 94,816 | 78,041 | 70,261 | 56,976 |  |  |
Net Income Available to Common Stockholders | $ 19,343 | $ 9,724 | $ 14,697 | $ 7,970 | $ 12,056 | $ 14,352 | $ 12,131 | $ 8,349 | $ 51,734 | $ 46,888 | $ 45,914
Earnings Per Share, Basic | $ 0.78 | $ 0.39 | $ 0.60 | $ 0.32 | $ 0.49 | $ 0.58 | $ 0.49 | $ 0.34 | $ 2.10 | $ 1.91 | $ 1.88
Earnings Per Share, Diluted | $ 0.67 | $ 0.35 | $ 0.52 | $ 0.30 | $ 0.43 | $ 0.51 | $ 0.43 | $ 0.31 | $ 1.84 | $ 1.68 | $ 1.65
Basic Weighted Average Shares Outstanding | 24,671 | 24,669 | 24,669 | 24,657 | 24,649 | 24,605 | 24,531 | 24,514 | 24,666 | 24,575 | 24,463
Diluted Weighted Average Shares Outstanding | 30,166 | 30,139 | 30,077 | 30,032 | 30,107 | 30,067 | 30,023 | 29,975 | 30,116 | 30,047 | 29,912
Standard and Extended Product Warranty Accrual, Period Increase (Decrease) |  |  |  |  |  |  |  |  | $ 19,409 | $ 0 | $ 0
Total valuation adjustments and write-offs |  |  |  |  |  |  |  |  | 3,992 | 3,600 | 3,457
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  | $ 0 | $ (7,842) | $ 0

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- Definition Total valuation adjustments and write-offs recorded during the period. + References No definition available. + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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