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Supplementary Financial Data Supplementary Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Supplementary Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 367,964 us-gaap_SalesRevenueNet | $ 330,767 us-gaap_SalesRevenueNet | $ 281,608 us-gaap_SalesRevenueNet | $ 234,841 us-gaap_SalesRevenueNet | $ 336,307 us-gaap_SalesRevenueNet | $ 275,195 us-gaap_SalesRevenueNet | $ 234,553 us-gaap_SalesRevenueNet | $ 190,727 us-gaap_SalesRevenueNet | $ 1,215,180 us-gaap_SalesRevenueNet | $ 1,036,782 us-gaap_SalesRevenueNet | $ 761,905 us-gaap_SalesRevenueNet
Gross margin | 73,759 us-gaap_GrossProfit | 68,509 us-gaap_GrossProfit | 59,587 us-gaap_GrossProfit | 50,877 us-gaap_GrossProfit | 67,030 us-gaap_GrossProfit | 54,909 us-gaap_GrossProfit | 46,216 us-gaap_GrossProfit | 38,314 us-gaap_GrossProfit |  |  |
Net Income (Loss) Available to Common Stockholders | $ 9,767 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 12,399 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 12,335 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 11,413 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 13,043 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 124,092 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 6,045 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 2,397 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 45,914 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 145,577 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 13,347 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings Per Share, Basic | $ 0.40 us-gaap_EarningsPerShareBasic | $ 0.51 us-gaap_EarningsPerShareBasic | $ 0.50 us-gaap_EarningsPerShareBasic | $ 0.47 us-gaap_EarningsPerShareBasic | $ 0.54 us-gaap_EarningsPerShareBasic | $ 5.09 us-gaap_EarningsPerShareBasic | $ 0.25 us-gaap_EarningsPerShareBasic | $ 0.11 us-gaap_EarningsPerShareBasic | $ 1.88 us-gaap_EarningsPerShareBasic | $ 6.11 us-gaap_EarningsPerShareBasic | $ 0.68 us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 0.44 us-gaap_EarningsPerShareDiluted | $ 0.44 us-gaap_EarningsPerShareDiluted | $ 0.41 us-gaap_EarningsPerShareDiluted | $ 0.48 us-gaap_EarningsPerShareDiluted | $ 4.22 us-gaap_EarningsPerShareDiluted | $ 0.25 us-gaap_EarningsPerShareDiluted | $ 0.11 us-gaap_EarningsPerShareDiluted | $ 1.65 us-gaap_EarningsPerShareDiluted | $ 5.24 us-gaap_EarningsPerShareDiluted | $ 0.67 us-gaap_EarningsPerShareDiluted
Basic Weighted Average Shares Outstanding | 24,489 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 24,474 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 24,470 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 24,417 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 24,358 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 24,358 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 24,271 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 22,273 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 24,463 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 23,822 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 19,651 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted Weighted Average Shares Outstanding | 29,944 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,921 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,913 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,870 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,783 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,745 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 24,646 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 22,688 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,912 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 28,763 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 19,891 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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