Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities
Net income	$ 39,433	$ 31,325
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	27,259	21,818
Amortization of contract acquisition costs	657	506
Amortization of debt issuance costs	349	319
Imputed interest expense and fair value adjustments to contingent consideration	(3,710)	670
Provision for doubtful accounts	219	478
Gain on disposal of assets	0	(106)
Impairment losses	0	1,205
Deferred income taxes	5,035	2,697
Excess tax benefit from equity-based awards	(1,050)	(1,046)
Equity-based compensation expense	5,881	6,577
Gain on foreign currency derivatives	(2,955)	(2,768)
Loss on deconsolidation of subsidiary, net of cash of zero and $897, respectively	0	2,758
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(9,238)	(2,804)
Prepaids and other assets	(631)	1,044
Accounts payable and accrued expenses	(22,965)	(14,151)
Deferred revenue and other liabilities	(6,654)	(8,311)
Net cash provided by operating activities	31,630	40,211
Cash flows from investing activities
Proceeds from sale of property, plant and equipment	135	0
Purchases of property, plant and equipment, net of acquisitions	(34,483)	(13,660)
Acquisitions, net of cash acquired of $812 and zero, respectively	(8,732)	(1,652)
Net cash used in investing activities	(43,080)	(15,312)
Cash flows from financing activities
Proceeds from line of credit	1,001,500	681,550
Payments on line of credit	(1,001,500)	(679,550)
Proceeds from other debt	0	3,709
Payments on other debt	(3,127)	(2,661)
Payments of contingent consideration related to acqusitions	(8,547)	0
Dividends distributed to noncontrolling interest	(3,713)	(2,385)
Proceeds from exercise of stock options	313	856
Excess tax benefit from equity-based awards	1,050	1,046
Purchase of treasury stock	(37,049)	(31,001)
Payments of debt issuance costs	0	1,732
Net cash used in financing activities	(51,073)	(30,168)
Effect of exchange rate changes on cash and cash equivalents	2,284	(8,593)
(Decrease) increase in cash and cash equivalents	(60,239)	(13,862)
Cash and cash equivalents, beginning of period	158,017	164,485
Cash and cash equivalents, end of period	97,778	150,623
Supplemental disclosures
Cash paid for interest	2,670	2,226
Cash paid for income taxes	7,486	8,913
Non-cash investing and financing activities
Acquisition of equipment through increase in accounts payable	1,420	0
Landlord incentives credited to deferred rent	$ 0	$ 511