CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 94,945	$ 81,712
Short-term investments	99,098	120,088
Total cash, cash equivalents and short-term investments	194,043	201,800
Trade accounts receivable:
Billed, net of allowance of $3,937 and $3,323	172,269	184,369
Unbilled	47,216	42,439
Deferred income taxes	7,478	13,204
Income taxes receivable	9,341	7,851
Other current assets	29,896	28,470
Total current assets	460,243	478,133
Non-current assets:
Property and equipment, net of depreciation of $144,486 and $138,065	36,962	38,326
Intangible assets	84,946	91,635
Goodwill	226,040	225,269
Deferred income taxes	8,478	8,890
Income taxes receivable	1,230	1,333
Other assets	18,886	16,142
Total non-current assets	376,542	381,595
Total assets	836,785	859,728
Current liabilities:
Current maturities of long-term debt, net of unamortized original issue discount of $11,106 and zero	146,394	22,500
Client deposits	33,162	35,791
Trade accounts payable	31,978	37,052
Accrued employee compensation	50,372	51,441
Deferred revenue	49,076	40,004
Income taxes payable	587	984
Other current liabilities	23,523	23,375
Total current liabilities	335,092	211,147
Non-current liabilities:
Long-term debt, net of unamortized original issue discount of zero and $14,169	138,750	233,331
Deferred revenue	9,268	9,648
Income taxes payable	1,613	1,613
Deferred income taxes	11,375	20,445
Other non-current liabilities	13,024	15,821
Total non-current liabilities	174,030	280,858
Total liabilities	$ 509,122	$ 492,005
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; 32,760 and 33,945 shares outstanding	$ 671	$ 667
Common stock warrants; 2,851 and 2,851 warrants issued and outstanding	7,310	6,694
Additional paid-in capital	483,595	486,414
Treasury stock, at cost, 34,356 and 32,763 shares	(804,437)	(757,478)
Accumulated other comprehensive income (loss):
Unrealized gain on short-term investments, net of tax	12	6
Cumulative foreign currency translation adjustments	(14,998)	(13,386)
Accumulated earnings	655,510	644,806
Total stockholders' equity	327,663	367,723
Total liabilities and stockholders' equity	836,785	859,728
Software
Non-current assets:
Intangible assets	40,332	44,732
Client contracts
Non-current assets:
Intangible assets	$ 44,614	$ 46,903