CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 132,631	$ 81,712
Short-term investments	108,305	120,088
Total cash, cash equivalents and short-term investments	240,936	201,800
Trade accounts receivable:
Billed, net of allowance of $3,600 and $3,323	178,854	184,369
Unbilled	41,110	42,439
Deferred income taxes	18,135	13,204
Income taxes receivable	4,038	4,088
Other current assets	35,153	28,470
Total current assets	518,226	474,370
Non-current assets:
Property and equipment, net of depreciation of $112,282 and $138,065	35,992	38,326
Goodwill	219,724	225,269
Deferred income taxes	8,382	8,890
Other assets	20,076	16,142
Total non-current assets	359,007	380,262
Total assets	877,233	854,632
Current liabilities:
Current maturities of long-term debt, net of unamortized original issue discount of $7,923 and zero	149,577	22,500
Client deposits	33,694	35,791
Trade accounts payable	43,392	37,052
Accrued employee compensation	59,607	51,441
Deferred revenue	41,907	40,004
Income taxes payable	8,962	2,672
Other current liabilities	22,980	23,375
Total current liabilities	360,119	212,835
Non-current liabilities:
Long-term debt, net of unamortized original issue discount of zero and $14,169	135,000	233,331
Deferred revenue	9,828	9,648
Income taxes payable	4,413	3,918
Deferred income taxes	9,237	20,446
Other non-current liabilities	12,791	15,821
Total non-current liabilities	171,269	283,164
Total liabilities	$ 531,388	$ 495,999
Stockholders' equity:
Preferred stock, par value $.01 per share; 10,000 shares authorized; zero shares issued and outstanding
Common stock, par value $.01 per share; 100,000 shares authorized; 4,664 and 6,032 shares reserved for employee stock purchase plan and stock incentive plans; 32,555 and 33,945 shares outstanding	$ 672	$ 667
Common stock warrants; 2,851 and 2,851 warrants issued and outstanding	7,310	6,694
Additional paid-in capital	503,254	486,414
Treasury stock, at cost, 34,601 and 32,763 shares	(814,437)	(757,478)
Accumulated other comprehensive income (loss):
Unrealized gain on short-term investments, net of tax	(97)	6
Cumulative foreign currency translation adjustments	(26,288)	(13,386)
Accumulated earnings	675,431	635,716
Total stockholders' equity	345,845	358,633
Total liabilities and stockholders' equity	877,233	854,632
Software
Non-current assets:
Intangible assets	35,095	44,732
Client contracts
Non-current assets:
Intangible assets	$ 39,738	$ 46,903