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Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 595,865 us-gaap_SalesRevenueNet |  | $ 560,303 us-gaap_SalesRevenueNet | $ 564,621 us-gaap_SalesRevenueNet |  | $ 636,999 us-gaap_SalesRevenueNet | $ 557,133 us-gaap_SalesRevenueNet |  | $ 539,869 us-gaap_SalesRevenueNet | $ 547,274 us-gaap_SalesRevenueNet |  | $ 611,836 us-gaap_SalesRevenueNet | $ 2,357,788 us-gaap_SalesRevenueNet | $ 2,256,112 us-gaap_SalesRevenueNet | $ 2,158,824 us-gaap_SalesRevenueNet
Gross profit | 101,359 us-gaap_GrossProfit |  | 100,817 us-gaap_GrossProfit | 95,453 us-gaap_GrossProfit |  | 106,176 us-gaap_GrossProfit | 89,978 us-gaap_GrossProfit |  | 97,409 us-gaap_GrossProfit | 97,746 us-gaap_GrossProfit |  | 108,118 us-gaap_GrossProfit | 403,805 us-gaap_GrossProfit | 393,251 us-gaap_GrossProfit | 382,221 us-gaap_GrossProfit
Operating income | 13,009 us-gaap_OperatingIncomeLoss | [1] | 14,460 us-gaap_OperatingIncomeLoss | 3,414 us-gaap_OperatingIncomeLoss | [2] | 16,591 us-gaap_OperatingIncomeLoss | 6,874 us-gaap_OperatingIncomeLoss | [3] | 17,112 us-gaap_OperatingIncomeLoss | 10,228 us-gaap_OperatingIncomeLoss |  | 22,009 us-gaap_OperatingIncomeLoss | 47,474 us-gaap_OperatingIncomeLoss | 56,223 us-gaap_OperatingIncomeLoss | 67,494 us-gaap_OperatingIncomeLoss
Net income | $ 8,164 us-gaap_NetIncomeLoss |  | $ 8,385 us-gaap_NetIncomeLoss | $ 1,891 us-gaap_NetIncomeLoss |  | $ 9,564 us-gaap_NetIncomeLoss | $ 5,289 us-gaap_NetIncomeLoss | [4] | $ 10,082 us-gaap_NetIncomeLoss | $ 3,488 us-gaap_NetIncomeLoss | [5] | $ 13,173 us-gaap_NetIncomeLoss | $ 28,004 us-gaap_NetIncomeLoss | $ 32,032 us-gaap_NetIncomeLoss | $ 40,402 us-gaap_NetIncomeLoss
Basic net income per share of common stock (in dollars per share) | $ 0.27 us-gaap_EarningsPerShareBasic | [6] | $ 0.33 us-gaap_EarningsPerShareBasic | $ 0.07 us-gaap_EarningsPerShareBasic |  | $ 0.37 us-gaap_EarningsPerShareBasic | $ 0.21 us-gaap_EarningsPerShareBasic |  | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.14 us-gaap_EarningsPerShareBasic |  | $ 0.51 us-gaap_EarningsPerShareBasic | $ 1.05 us-gaap_EarningsPerShareBasic | $ 1.25 us-gaap_EarningsPerShareBasic | $ 1.57 us-gaap_EarningsPerShareBasic
Diluted net income per share (in dollars per share) | $ 0.27 us-gaap_EarningsPerShareDiluted | [6] | $ 0.33 us-gaap_EarningsPerShareDiluted | $ 0.07 us-gaap_EarningsPerShareDiluted |  | $ 0.37 us-gaap_EarningsPerShareDiluted | $ 0.21 us-gaap_EarningsPerShareDiluted |  | $ 0.39 us-gaap_EarningsPerShareDiluted | $ 0.14 us-gaap_EarningsPerShareDiluted |  | $ 0.51 us-gaap_EarningsPerShareDiluted | $ 1.05 us-gaap_EarningsPerShareDiluted | $ 1.25 us-gaap_EarningsPerShareDiluted | $ 1.56 us-gaap_EarningsPerShareDiluted
[1] | Includes a $1.2 million non-cash charge in the fourth quarter of 2014. Please read Note 1 to the Consolidated Financial Statements, “Accounting Policies,” for additional information.
[2] | Includes a non-cash impairment charge in the second quarter of 2014 of $2.5 million. Please read Note 5, “Goodwill and Other Intangible Assets,” for additional information.
[3] | Includes a non-cash impairment charge in the fourth quarter of 2013 of $3.3 million. Please read Note 5, “Goodwill and Other Intangible Assets,” for additional information.
[4] | Includes a $2.0 million tax benefit related to tax years 2009 through 2012. Please read Note 9 to the Consolidated Financial Statements, “Income Taxes,” for additional information.
[5] | Includes a non-cash impairment charge in the second quarter of 2013 of $2.7 million. Please read Note 6 to the Consolidated Financial Statements, “Other Assets,” for additional information.
[6] | Includes the impact of dividends exceeding earnings under the two-class method, resulting in a $0.05 earnings per share decrease in the fourth quarter of 2014. Please read Note 12, “Net Income Per Share,” for additional information.

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