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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current Assets:    
Cash and cash equivalents $ 137,377 $ 114,047
Restricted cash 3,750  
Short term investments - available for sale 59,379 76,183
Accounts receivable, net 261,062 285,419
Unbilled revenue 115,431 112,483
Other receivables 18,298 13,387
Deferred tax asset 21,394 20,574
Prepayments and other current assets 22,402 23,155
Income taxes receivable 16,645 18,500
Total current assets 655,738 663,748
Other Assets:    
Property, plant and equipment, net 162,629 168,373
Goodwill 354,175 315,441
Non-current other assets 6,075 5,584
Non-current income taxes receivable 15,349 9,506
Non-current deferred tax asset 5,080 5,009
Intangible assets 32,174 34,447
Total Assets 1,231,220 1,202,108
Current Liabilities:    
Accounts payable 6,793 8,149
Payments on account 221,720 219,467
Other liabilities 191,536 181,092
Deferred tax liability 66 144
Income taxes payable 7,283 4,570
Total current liabilities 427,398 413,422
Other Liabilities:    
Non-current other liabilities 14,318 14,312
Non-current government grants 1,326 1,427
Non-current income taxes payable 7,860 5,650
Non-current deferred tax liability 12,386 12,722
Shareholders' Equity:    
Ordinary shares, par value 6 euro cents per share; 100,000,000 shares authorized, 60,543,753 shares issued and outstanding at March 31, 2013 and 60,287,498 shares issued and outstanding at December 31, 2012 5,088 5,067
Additional paid-in capital 244,644 237,217
Capital redemption reserve 100 100
Accumulated other comprehensive income (21,912) (8,776)
Retained earnings 540,012 520,967
Total Shareholders' Equity 767,932 754,575
Total Liabilities and Shareholders' Equity $ 1,231,220 $ 1,202,108