Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 10,359	$ 6,307
Accounts receivable, net	107,286	112,194
Prepaid expenses	4,523	4,470
Other current assets	3,483	6,237
Total current assets	125,651	129,208
Property and equipment, net	6,678	7,145
Goodwill	315,405	305,238
Intangible assets, net	48,995	51,066
Other non-current assets	7,811	6,403
Total assets	504,540	499,060
Current liabilities:
Accounts payable	14,495	23,196
Other current liabilities	41,662	38,077
Total current liabilities	56,157	61,273
Long-term debt	56,000	55,000
Other non-current liabilities	18,631	16,436
Total liabilities	130,788	132,709
STOCKHOLDERS' EQUITY ATTRIBUTABLE TO PARENT
Common stock (par value $.001 per share; 100,000,000 authorized; 47,920,263 shares issued and 33,228,199 shares outstanding as of June 30, 2018; 47,370,945 shares issued and 33,249,665 shares outstanding as of December 31, 2017)	48	47
Additional paid-in capital	414,610	403,906
Accumulated other comprehensive loss	(2,474)	(1,822)
Treasury stock, at cost (14,692,064 shares as of June 30, 2018; 14,121,280 shares as of December 31, 2017)	(177,301)	(163,871)
Retained earnings	138,869	128,091
Total stockholders’ equity	373,752	366,351
Total liabilities and stockholders’ equity	$ 504,540	$ 499,060

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.