Annual report pursuant to Section 13 and 15(d)

UNAUDITED QUARTERLY DATA (Details)

v2.4.1.9
UNAUDITED QUARTERLY DATA (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
UNAUDITED QUARTERLY DATA                      
Revenues $ 343,951us-gaap_SalesRevenueServicesNet $ 384,870us-gaap_SalesRevenueServicesNet $ 369,357us-gaap_SalesRevenueServicesNet $ 313,388us-gaap_SalesRevenueServicesNet $ 324,707us-gaap_SalesRevenueServicesNet $ 362,155us-gaap_SalesRevenueServicesNet $ 350,798us-gaap_SalesRevenueServicesNet $ 299,714us-gaap_SalesRevenueServicesNet $ 1,411,566us-gaap_SalesRevenueServicesNet $ 1,337,374us-gaap_SalesRevenueServicesNet $ 1,270,909us-gaap_SalesRevenueServicesNet
Gross profit (Revenues less cost of services provided) 168,972us-gaap_GrossProfit 196,060us-gaap_GrossProfit 186,715us-gaap_GrossProfit 152,080us-gaap_GrossProfit 157,350us-gaap_GrossProfit 181,020us-gaap_GrossProfit 176,437us-gaap_GrossProfit 144,108us-gaap_GrossProfit      
Net Income $ 29,917us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 41,121us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 40,860us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 25,766us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 27,957us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 36,200us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 35,994us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 23,179us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 137,664us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 123,330us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 111,332us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Income per share:                      
Income per share Basic (in dollars per share) $ 0.21us-gaap_EarningsPerShareBasic $ 0.28us-gaap_EarningsPerShareBasic $ 0.28us-gaap_EarningsPerShareBasic $ 0.18us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic $ 0.25us-gaap_EarningsPerShareBasic $ 0.25us-gaap_EarningsPerShareBasic $ 0.16us-gaap_EarningsPerShareBasic $ 0.94us-gaap_EarningsPerShareBasic $ 0.84us-gaap_EarningsPerShareBasic $ 0.76us-gaap_EarningsPerShareBasic
Income per share Diluted (in dollars per share) $ 0.21us-gaap_EarningsPerShareDiluted $ 0.28us-gaap_EarningsPerShareDiluted $ 0.28us-gaap_EarningsPerShareDiluted $ 0.18us-gaap_EarningsPerShareDiluted $ 0.19us-gaap_EarningsPerShareDiluted $ 0.25us-gaap_EarningsPerShareDiluted $ 0.25us-gaap_EarningsPerShareDiluted $ 0.16us-gaap_EarningsPerShareDiluted $ 0.94us-gaap_EarningsPerShareDiluted $ 0.84us-gaap_EarningsPerShareDiluted $ 0.76us-gaap_EarningsPerShareDiluted