Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities:
Net income	$ 3,260	$ 2,024
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,636	14,848
Amortization of deferred rent	99	138
Share-based compensation	5,419	6,136
Excess tax benefit related to share-based compensation	(4,766)	(2,086)
Provision for doubtful accounts	2,116	1,918
Amortization of deferred financing costs	381	587
Deferred income taxes	348	(1,759)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(7,562)	(14,763)
Prepaid expenses and other current assets	(2,184)	1,010
Accounts payable and accrued expenses	(2,729)	4,668
Accrued interest expense	7,169	(5,640)
Deferred revenue and customer deposits	(108)	(133)
Other liabilities	(2,313)	(784)
Net cash provided by operating activities	15,766	6,164
Investing activities:
Cash paid for acquisitions, net	(92,348)	(2,299)
Purchases of building, equipment and leasehold improvements, net	(2,737)	(2,229)
Working capital and other settlements for acquisitions	(271)	(91)
Proceeds from foreign currency net investment hedges	1,649	4,812
Other	(150)	(1,250)
Net cash used in investing activities	(93,857)	(1,057)
Financing activities:
Borrowings under senior secured revolving credit facility	75,000	25,478
Excess tax benefit related to share-based compensation	4,766	2,086
Proceeds from the exercise of options and warrants	$ 582	8,855
Repayment of contingent earnout obligation		(1,023)
Net repayments under working capital facilities	$ (1,623)	$ (132)
Purchases of stock for treasury	(8,006)
Repayments under senior secured revolving credit facility	(25,000)	$ (29,331)
Net cash provided by financing activities	45,719	5,933
Exchange rate impact on cash and cash equivalents	506	(509)
Net increase (decrease) in cash and cash equivalents	(31,866)	10,531
Cash and cash equivalents, beginning of period	47,865	9,751
Cash and cash equivalents, end of period	15,999	20,282
Supplemental disclosures of cash flow information:
Cash paid for interest	825	12,979
Cash paid for income taxes	$ 4,457	$ 2,703