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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities    
Net income $ 54,122 $ 50,494
Adjustment to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 41,152 33,281
Amortization of contract acquisition costs 740 753
Amortization of debt issuance costs 527 488
Imputed interest expense and fair value adjustments to contingent consideration (3,675) 933
Provision for doubtful accounts 471 412
Gain on disposal of assets 0 (94)
Impairment losses 0 1,205
Deferred income taxes 13,051 5,467
Excess tax benefit from equity-based awards (1,086) (1,074)
Equity-based compensation expense 9,031 9,842
Gain on foreign currency derivatives 1,756 (75)
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 (24,179) 709
Prepaids and other assets (16,118) (11,241)
Accounts payable and accrued expenses (17,830) (14,020)
Deferred revenue and other liabilities 3,945 (3,225)
Net cash provided by operating activities 61,907 76,613
Cash flows from investing activities    
Proceeds from sale of property, plant and equipment 135 0
Purchases of property, plant and equipment, net of acquisitions (52,234) (31,832)
Acquisitions, net of cash acquired of $3,525 and $6,423, respectively (23,903) (8,956)
Net cash used in investing activities (76,002) (40,788)
Cash flows from financing activities    
Proceeds from line of credit 1,540,100 1,114,050
Payments on line of credit (1,525,100) (1,104,050)
Proceeds from other debt 0 3,709
Payments on other debt (3,769) (4,293)
Payments of contingent consideration related to acqusitions (8,547) 0
Dividends distributed to noncontrolling interest (4,838) (3,420)
Proceeds from exercise of stock options 314 856
Excess tax benefit from equity-based awards 1,086 1,074
Purchase of treasury stock (47,281) (51,627)
Payments of debt issuance costs 0 (1,800)
Net cash used in financing activities (48,035) (45,501)
Effect of exchange rate changes on cash and cash equivalents (8,275) (9,906)
(Decrease) increase in cash and cash equivalents (70,405) (19,582)
Cash and cash equivalents, beginning of period 158,017 164,485
Cash and cash equivalents, end of period 87,612 144,903
Supplemental disclosures    
Cash paid for interest 4,038 3,271
Cash paid for income taxes 10,540 12,329
Non-cash investing and financing activities    
Acquisition of equipment through increase in accounts payable 2,944 3,803
Landlord incentives credited to deferred rent 0 1,016
Contract acquisition costs credited to accounts receivable $ 0 $ 1,000