Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 211,985	$ 187,322
Receivables, net	264,916	247,633
Prepaid expenses	15,710	12,370
Other current assets	20,672	20,017
Total current assets	513,283	467,342
Property and equipment, net	117,549	101,295
Goodwill, net	199,802	204,231
Intangibles, net	76,055	92,037
Deferred charges and other assets	43,572	43,784
Total assets	950,261	908,689
Current liabilities:
Accounts payable	25,540	24,985
Accrued employee compensation and benefits	81,064	73,103
Current deferred income tax liabilities	84	92
Income taxes payable	1,274	800
Deferred revenue	35,025	34,283
Other accrued expenses and current liabilities	30,393	31,320
Total current liabilities	173,380	164,583
Deferred grants	6,637	7,607
Long-term debt	98,000	91,000
Long-term income tax liabilities	24,647	26,162
Other long-term liabilities	11,893	13,073
Total liabilities	314,557	302,425
Commitments and loss contingency (Note 24)
Shareholders' equity:
Preferred stock, $0.01 par value, 10,000 shares authorized; no shares issued and outstanding
Common stock, $0.01 par value, 200,000 shares authorized; 43,997 and 43,790 shares issued, respectively	440	438
Additional paid-in capital	279,513	277,192
Retained earnings	349,366	315,187
Accumulated other comprehensive income	7,997	14,856
Treasury stock at cost: 122 shares and 108 shares, respectively	(1,612)	(1,409)
Total shareholders' equity	635,704	606,264
Total liabilities and shareholders' equity	$ 950,261	$ 908,689