Condensed Consolidated Balance Sheet - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 43,474	$ 30,562
Accounts receivable, net of allowance for doubtful accounts of $3,712 and $3,534, respectively	183,012	205,386
Unbilled revenue	47,685	50,016
Inventories	38,563	40,694
Prepaid expenses	19,846	18,565
Other current assets	33,716	37,865
Total current assets	366,296	383,088
Property and equipment, net	37,207	36,714
Intangibles and other assets:
Goodwill	200,743	199,946
Intangible assets, net	26,641	27,563
Deferred income taxes	947	691
Other non-current assets	2,139	1,636
Total intangibles and other assets	230,470	229,836
Total assets	633,973	649,638
Current liabilities:
Accounts payable	120,260	141,164
Accrued expenses	40,081	34,391
Deferred revenue	31,524	17,620
Other current liabilities	24,073	24,078
Total current liabilities	215,938	217,253
Revolving credit facility	118,886	128,398
Deferred income taxes	12,208	12,043
Other non-current liabilities	7,287	7,399
Total liabilities	354,319	365,093
Commitments and contingencies (See Note 12)
Stockholders' equity:
Common stock, par value $0.0001 per share, 200,000 and 200,000 shares authorized, 64,103 and 64,075 shares issued, and 53,151 and 54,055 shares outstanding, respectively	6	6
Additional paid-in capital	236,664	235,199
Treasury stock at cost, 10,952 and 10,020 shares, respectively	(64,544)	(55,873)
Accumulated other comprehensive loss	(15,865)	(19,229)
Retained earnings	123,393	124,442
Total stockholders' equity	279,654	284,545
Total liabilities and stockholders' equity	$ 633,973	$ 649,638