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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) (USD $) In Thousands, except 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
QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 664,848 us-gaap_SalesRevenueServicesNet | $ 711,295 us-gaap_SalesRevenueServicesNet | $ 658,646 us-gaap_SalesRevenueServicesNet | $ 577,904 us-gaap_SalesRevenueServicesNet | $ 578,549 us-gaap_SalesRevenueServicesNet | $ 623,414 us-gaap_SalesRevenueServicesNet | $ 576,899 us-gaap_SalesRevenueServicesNet | $ 520,687 us-gaap_SalesRevenueServicesNet | $ 2,612,693 us-gaap_SalesRevenueServicesNet | $ 2,299,549 us-gaap_SalesRevenueServicesNet | $ 2,065,999 us-gaap_SalesRevenueServicesNet
Operating expenses | 646,799 us-gaap_CostsAndExpenses | 678,354 us-gaap_CostsAndExpenses | 631,694 us-gaap_CostsAndExpenses | 586,606 us-gaap_CostsAndExpenses | 565,047 us-gaap_CostsAndExpenses | 602,912 us-gaap_CostsAndExpenses | 568,482 us-gaap_CostsAndExpenses | 544,037 us-gaap_CostsAndExpenses | 2,543,454 us-gaap_CostsAndExpenses | 2,280,479 us-gaap_CostsAndExpenses | 2,080,567 us-gaap_CostsAndExpenses
OPERATING INCOME (LOSS) | 18,049 us-gaap_OperatingIncomeLoss | 32,941 us-gaap_OperatingIncomeLoss | 26,952 us-gaap_OperatingIncomeLoss | (8,702)us-gaap_OperatingIncomeLoss | 13,502 us-gaap_OperatingIncomeLoss | 20,502 us-gaap_OperatingIncomeLoss | 8,417 us-gaap_OperatingIncomeLoss | (23,350)us-gaap_OperatingIncomeLoss | 69,239 us-gaap_OperatingIncomeLoss | 19,070 us-gaap_OperatingIncomeLoss | (14,568)us-gaap_OperatingIncomeLoss
Other income (costs), net | 1,591 us-gaap_NonoperatingIncomeExpense | (385)us-gaap_NonoperatingIncomeExpense | 419 us-gaap_NonoperatingIncomeExpense | (253)us-gaap_NonoperatingIncomeExpense | 393 us-gaap_NonoperatingIncomeExpense | 502 us-gaap_NonoperatingIncomeExpense | (552)us-gaap_NonoperatingIncomeExpense | 47 us-gaap_NonoperatingIncomeExpense | 1,373 us-gaap_NonoperatingIncomeExpense | 391 us-gaap_NonoperatingIncomeExpense | (2,424)us-gaap_NonoperatingIncomeExpense
Income tax provision (benefit) | 5,097 us-gaap_IncomeTaxExpenseBenefit | 12,938 us-gaap_IncomeTaxExpenseBenefit | 10,163 us-gaap_IncomeTaxExpenseBenefit | (3,762)us-gaap_IncomeTaxExpenseBenefit | 3,549 us-gaap_IncomeTaxExpenseBenefit | 7,022 us-gaap_IncomeTaxExpenseBenefit | 2,987 us-gaap_IncomeTaxExpenseBenefit | (9,908)us-gaap_IncomeTaxExpenseBenefit | 24,435 us-gaap_IncomeTaxExpenseBenefit | 3,650 us-gaap_IncomeTaxExpenseBenefit | (9,260)us-gaap_IncomeTaxExpenseBenefit
Net income (loss) | $ 14,543 us-gaap_NetIncomeLoss | $ 19,618 us-gaap_NetIncomeLoss | $ 17,208 us-gaap_NetIncomeLoss | $ (5,193)us-gaap_NetIncomeLoss | $ 10,346 us-gaap_NetIncomeLoss | $ 13,982 us-gaap_NetIncomeLoss | $ 4,878 us-gaap_NetIncomeLoss | $ (13,395)us-gaap_NetIncomeLoss | $ 46,177 us-gaap_NetIncomeLoss | $ 15,811 us-gaap_NetIncomeLoss | $ (7,732)us-gaap_NetIncomeLoss
Earnings (loss) per common share |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.53 us-gaap_EarningsPerShareBasic | $ 0.72 us-gaap_EarningsPerShareBasic | $ 0.63 us-gaap_EarningsPerShareBasic | $ (0.20)us-gaap_EarningsPerShareBasic | $ 0.38 us-gaap_EarningsPerShareBasic | $ 0.52 us-gaap_EarningsPerShareBasic | $ 0.18 us-gaap_EarningsPerShareBasic | $ (0.52)us-gaap_EarningsPerShareBasic | $ 1.69 us-gaap_EarningsPerShareBasic | $ 0.59 us-gaap_EarningsPerShareBasic | $ (0.31)us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ 0.53 us-gaap_EarningsPerShareDiluted | $ 0.72 us-gaap_EarningsPerShareDiluted | $ 0.63 us-gaap_EarningsPerShareDiluted | $ (0.20)us-gaap_EarningsPerShareDiluted | $ 0.38 us-gaap_EarningsPerShareDiluted | $ 0.52 us-gaap_EarningsPerShareDiluted | $ 0.18 us-gaap_EarningsPerShareDiluted | $ (0.52)us-gaap_EarningsPerShareDiluted | $ 1.69 us-gaap_EarningsPerShareDiluted | $ 0.59 us-gaap_EarningsPerShareDiluted | $ (0.31)us-gaap_EarningsPerShareDiluted
AVERAGE COMMON SHARES OUTSTANDING |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 26,073,256 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 26,054,678 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 26,005,105 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,876,928 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,785,485 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,736,810 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,694,327 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,638,333 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,993,255 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,714,205 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,564,752 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) | 26,073,256 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 26,054,678 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 26,005,105 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 25,876,928 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 25,793,366 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 25,736,810 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 25,694,327 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 25,638,333 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 25,993,612 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 25,714,205 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 25,564,752 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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