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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 $ 595,865us-gaap_SalesRevenueNet $ 560,303us-gaap_SalesRevenueNet $ 564,621us-gaap_SalesRevenueNet $ 636,999us-gaap_SalesRevenueNet $ 557,133us-gaap_SalesRevenueNet $ 539,869us-gaap_SalesRevenueNet $ 547,274us-gaap_SalesRevenueNet $ 611,836us-gaap_SalesRevenueNet $ 2,357,788us-gaap_SalesRevenueNet $ 2,256,112us-gaap_SalesRevenueNet $ 2,158,824us-gaap_SalesRevenueNet
Gross profit 101,359us-gaap_GrossProfit 100,817us-gaap_GrossProfit 95,453us-gaap_GrossProfit 106,176us-gaap_GrossProfit 89,978us-gaap_GrossProfit 97,409us-gaap_GrossProfit 97,746us-gaap_GrossProfit 108,118us-gaap_GrossProfit 403,805us-gaap_GrossProfit 393,251us-gaap_GrossProfit 382,221us-gaap_GrossProfit
Operating income 13,009us-gaap_OperatingIncomeLoss [1] 14,460us-gaap_OperatingIncomeLoss 3,414us-gaap_OperatingIncomeLoss [2] 16,591us-gaap_OperatingIncomeLoss 6,874us-gaap_OperatingIncomeLoss [3] 17,112us-gaap_OperatingIncomeLoss 10,228us-gaap_OperatingIncomeLoss 22,009us-gaap_OperatingIncomeLoss 47,474us-gaap_OperatingIncomeLoss 56,223us-gaap_OperatingIncomeLoss 67,494us-gaap_OperatingIncomeLoss
Net income $ 8,164us-gaap_NetIncomeLoss $ 8,385us-gaap_NetIncomeLoss $ 1,891us-gaap_NetIncomeLoss $ 9,564us-gaap_NetIncomeLoss $ 5,289us-gaap_NetIncomeLoss [4] $ 10,082us-gaap_NetIncomeLoss $ 3,488us-gaap_NetIncomeLoss [5] $ 13,173us-gaap_NetIncomeLoss $ 28,004us-gaap_NetIncomeLoss $ 32,032us-gaap_NetIncomeLoss $ 40,402us-gaap_NetIncomeLoss
Basic net income per share of common stock (in dollars per share) $ 0.27us-gaap_EarningsPerShareBasic [6] $ 0.33us-gaap_EarningsPerShareBasic $ 0.07us-gaap_EarningsPerShareBasic $ 0.37us-gaap_EarningsPerShareBasic $ 0.21us-gaap_EarningsPerShareBasic $ 0.39us-gaap_EarningsPerShareBasic $ 0.14us-gaap_EarningsPerShareBasic $ 0.51us-gaap_EarningsPerShareBasic $ 1.05us-gaap_EarningsPerShareBasic $ 1.25us-gaap_EarningsPerShareBasic $ 1.57us-gaap_EarningsPerShareBasic
Diluted net income per share (in dollars per share) $ 0.27us-gaap_EarningsPerShareDiluted [6] $ 0.33us-gaap_EarningsPerShareDiluted $ 0.07us-gaap_EarningsPerShareDiluted $ 0.37us-gaap_EarningsPerShareDiluted $ 0.21us-gaap_EarningsPerShareDiluted $ 0.39us-gaap_EarningsPerShareDiluted $ 0.14us-gaap_EarningsPerShareDiluted $ 0.51us-gaap_EarningsPerShareDiluted $ 1.05us-gaap_EarningsPerShareDiluted $ 1.25us-gaap_EarningsPerShareDiluted $ 1.56us-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.