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Long-Term Debt (Narrative) (Details)
 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2011
Senior Notes-7.125% Due 2016 [Member]
USD ($)
Dec. 31, 2006
Senior Notes-7.125% Due 2016 [Member]
USD ($)
Dec. 31, 2010
Senior Notes-7.125% Due 2016 [Member]
Dec. 31, 2011
Foundry Park I Mortgage Loan [Member]
years
Dec. 31, 2010
Foundry Park I Mortgage Loan [Member]
USD ($)
months
Dec. 31, 2011
India Line Of Credit [Member]
USD ($)
Dec. 31, 2011
India Line Of Credit [Member]
INR
Dec. 31, 2010
India Line Of Credit [Member]
Dec. 31, 2011
China Line Of Credit [Member]
USD ($)
Nov. 12, 2010
Revolving Credit Agreement [Member]
USD ($)
Dec. 31, 2010
Revolving Credit Agreement [Member]
USD ($)
Dec. 31, 2011
Revolving Credit Agreement [Member]
USD ($)
Nov. 12, 2010
Revolving Credit Agreement [Member]
Multicurrency Borrowings [Member]
USD ($)
Nov. 12, 2010
Revolving Credit Agreement [Member]
Letter Of Credit [Member]
USD ($)
Nov. 12, 2010
Revolving Credit Agreement [Member]
Swingline Loans [Member]
USD ($)
Dec. 31, 2011
Revolving Credit Facility [Member]
Dec. 31, 2010
Revolving Credit Facility [Member]
USD ($)
Dec. 31, 2011
Revolving Credit Facility [Member]
Loans Bearing Interest Based On ABR [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Loans Bearing Interest Based On Adjusted LIBO Rate [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Maximum [Member]
Loans Bearing Interest Based On ABR [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Maximum [Member]
Loans Bearing Interest Based On Adjusted LIBO Rate [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Minimum [Member]
Loans Bearing Interest Based On ABR [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Minimum [Member]
Loans Bearing Interest Based On Adjusted LIBO Rate [Member]
Debt Instrument [Line Items]                                                    
Debt instrument, maturity date       2016                                            
Senior notes, interest rate 7.125%     7.125%   7.125%                                        
Outstanding borrowings                 $ 1,700,000 90,000,000   $ 6,300,000     $ 22,000,000                      
Outstanding letters of credit 6,100,000                                                  
Increase in aggregate amount of revolving credit facility allowed                         150,000,000                          
Unused portion of senior credit facility                             271,900,000                      
Financing costs incurred 3,233,000 3,992,000 465,000 3,000,000 3,000,000     1,500,000                       2,500,000            
Additional financing fees expensed 1,000,000     1,000,000                                            
Minimum fixed charge ratio       2.00                                            
Maximum borrowing capacity                   110,000,000   10,000,000 300,000,000     100,000,000 100,000,000 20,000,000                
Credit facility termination date                 2012 2012   2012             November 12, 2015              
Line of credit facility financing costs carried over                           700,000                        
Line of credit facility total financing costs deferred                           3,200,000                        
Basis spread on federal funds effective rate                                     0.50%              
Basis spread on adjusted LIBO rate               4.00%                     1.00%              
Applicable Rate                                         1.00% 2.00% 1.50% 2.50% 1.00% 2.00%
Interest rate at period end                                     4.25%              
Debt instrument interest rate at period end             4.27%                                      
Consolidated leverage ratio                                     3.00              
Consolidated interest coverage ratio                                     3.00              
Term of loan collateralized by office building (years)             5                                      
Number of extension options               2                                    
Extension period (months)               13                                    
Borrowing under Foundry Park I mortgage loan 0 68,400,000 0                                              
Period of amortization schedule (years)             15                                      
Interest rate swap, fixed interest rate             2.642%                                      
Interest rate swap term, in years.             5                                      
Average interest rate at period end                 11.10% 11.10%   2.50%                            
Average interest rate during period                 10.80% 10.80% 9.80% 2.30%             2.90%              
Capital lease obligation paid off in 2011 $ 0 $ 144,000