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CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 01, 2017
Sep. 23, 2016
Oct. 01, 2017
Sep. 23, 2016
Revenue from services $ 660,780 $ 697,097 $ 1,839,146 $ 2,015,689
Cost of services 488,761 518,702 1,372,418 1,516,858
Gross profit 172,019 178,395 466,728 498,831
Selling, general and administrative expense 131,552 134,679 378,150 401,090
Depreciation and amortization 11,189 11,690 34,650 34,673
Goodwill and intangible asset impairment charge 0 4,275 0 103,544
Income (loss) from operations 29,278 27,751 53,928 (40,476)
Interest expense (1,365) (1,721) (3,893) (5,430)
Interest and other income 1,146 854 3,903 2,657
Interest and other income (expense), net (219) (867) 10 (2,773)
Income (loss) before tax expense 29,059 26,884 53,938 (43,249)
Income tax expense (benefit) 7,838 3,455 14,909 (9,911)
Net income (loss) $ 21,221 $ 23,429 $ 39,029 $ (33,338)
Net income (loss) per common share:        
Basic (in dollars per share) $ 0.52 $ 0.56 $ 0.94 $ (0.80)
Diluted (in dollars per share) $ 0.51 $ 0.56 $ 0.94 $ (0.80)
Weighted average shares outstanding:        
Basic (in shares) 41,046 41,762 41,420 41,651
Diluted (in shares) 41,276 42,056 41,671 41,651
Other comprehensive income:        
Total other comprehensive income, net of tax $ 1,567 $ 2,031 $ 4,553 $ 4,287
Comprehensive income (loss) 22,788 25,460 43,582 (29,051)
Foreign currency translation adjustment        
Other comprehensive income:        
Foreign currency translation adjustment 1,143 1,247 3,483 3,341
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Other comprehensive income:        
Unrealized gain on investments, net of tax $ 424 $ 784 $ 1,070 $ 946