Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 22,532us-gaap_ProfitLoss	$ 16,048us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,386	19,615
Amortization of original issue discount and deferred financing costs	848	753
Loss on foreign currency transactions	185	69
Non-cash revenue and other	(80)us-gaap_OtherNoncashIncome	(80)us-gaap_OtherNoncashIncome
Loss on disposal of fixed assets	114	292
Stock-based compensation	2,300us-gaap_ShareBasedCompensation	2,385us-gaap_ShareBasedCompensation
Deferred rent	967	780
Deferred income taxes	4,395us-gaap_DeferredIncomeTaxExpenseBenefit	(88)us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in assets and liabilities:
Accounts receivable	8,180us-gaap_IncreaseDecreaseInReceivables	19,353us-gaap_IncreaseDecreaseInReceivables
Prepaid expenses and other current assets	(4,267)	3,995
Accounts payable and accrued expenses	(6,912)	(3,301)
Deferred revenue	(241)	826
Accrued rent and related obligations	(200)	554
Other assets	(808)	154
Other current and long-term liabilities	863	(9,714)
Net cash provided by operating activities	47,262	51,641
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of fixed assets	(16,911)	(14,291)
Payments for acquisitions, net of cash acquired	(1,086)	0
Settlement of purchase price for prior year acquisitions	14	175
Net cash used in investing activities	(17,983)	(14,116)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments of long-term debt	(2,388)us-gaap_RepaymentsOfLongTermDebt	(1,975)us-gaap_RepaymentsOfLongTermDebt
Purchase of treasury stock	(738)	0
Proceeds from issuance of common stock upon exercise of options	4,210	3,985
Proceeds from issuance of restricted stock	3,864	4,709
Tax benefit from stock-based compensation	3,072	1,858
Net cash provided by financing activities	8,020	8,577
Effect of exchange rates on cash and cash equivalents	(1,524)	47
Net increase in cash and cash equivalents	35,775	46,149
Cash and cash equivalents—beginning of period	87,886	29,585
Cash and cash equivalents—end of period	123,661	75,734
NON-CASH TRANSACTION:
Fixed asset purchases recorded in accounts payable and accrued expenses	2,000	2,000
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash payments of interest	9,334us-gaap_InterestPaid	8,283us-gaap_InterestPaid
Cash payments of taxes	$ 11,503us-gaap_IncomeTaxesPaid	$ 8,218us-gaap_IncomeTaxesPaid

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