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v2.4.1.9

Operations and Summary of Significant Accounting Policies - Revisions and Out of Period Adjustments (Details) (USD $) | 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
Deferred tax asset, current | $ 14,662,000 us-gaap_DeferredTaxAssetsNetCurrent |  |  |  | $ 15,611,000 us-gaap_DeferredTaxAssetsNetCurrent |  |  |  | $ 14,662,000 us-gaap_DeferredTaxAssetsNetCurrent | $ 15,611,000 us-gaap_DeferredTaxAssetsNetCurrent |
Gross profit | 72,797,000 us-gaap_GrossProfit | 95,553,000 us-gaap_GrossProfit | 95,900,000 us-gaap_GrossProfit | 77,780,000 us-gaap_GrossProfit | 69,744,000 us-gaap_GrossProfit | 89,895,000 us-gaap_GrossProfit | 89,172,000 us-gaap_GrossProfit | 64,720,000 us-gaap_GrossProfit | 342,030,000 us-gaap_GrossProfit | 313,531,000 us-gaap_GrossProfit | 282,472,000 us-gaap_GrossProfit
Income from operations | 15,320,000 us-gaap_OperatingIncomeLoss | 32,218,000 us-gaap_OperatingIncomeLoss | 32,133,000 us-gaap_OperatingIncomeLoss | 19,605,000 us-gaap_OperatingIncomeLoss | 11,902,000 us-gaap_OperatingIncomeLoss | 30,885,000 us-gaap_OperatingIncomeLoss | 29,678,000 us-gaap_OperatingIncomeLoss | 9,013,000 us-gaap_OperatingIncomeLoss | 99,276,000 us-gaap_OperatingIncomeLoss | 81,478,000 us-gaap_OperatingIncomeLoss | 61,709,000 us-gaap_OperatingIncomeLoss
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
Deferred tax asset, current |  |  |  |  | 2,900,000 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |  |  |  | 2,900,000 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Gross profit |  |  |  | 2,300,000 us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |  |  |  |  |  |
Income from operations |  |  |  | 2,000,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |  |  |  |  |  |
Net income |  |  |  | $ 1,300,000 us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |  |  |  |  |  |

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