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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities      
Net income $ 12,438 $ 47,966 $ 54,122
Adjustment to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 15,486 46,529 41,152
Amortization of contract acquisition costs   754 740
Amortization of debt issuance costs   534 527
Imputed interest expense and fair value adjustments to contingent consideration   786 (3,675)
Provision for doubtful accounts   964 471
Gain on disposal of assets   (118)  
Impairment losses 3,066 3,066  
Deferred income taxes   4,380 13,051
Excess tax benefit from equity-based awards   (420) (1,086)
Equity-based compensation expense 3,300 8,569 9,031
Loss (gain) on foreign currency derivatives   4,820 1,756
Changes in assets and liabilities, net of acquisitions:      
Accounts receivable   4,722 (24,179)
Prepaids and other assets   (6,839) (16,118)
Accounts payable and accrued expenses   11,857 (17,830)
Deferred revenue and other liabilities   (11,406) 3,945
Net cash provided by operating activities   116,164 61,907
Cash flows from investing activities      
Proceeds from sale of long lived assets   116 135
Purchases of property, plant and equipment, net of acquisitions (19,679) (49,184) (52,234)
Investments in non-marketable equity investments   (9,000)  
Acquisitions, net of cash acquired of zero and $812, respectively   (1,776) (23,903)
Net cash used in investing activities   (59,844) (76,002)
Cash flows from financing activities      
Proceeds from line of credit   1,697,500 1,540,100
Payments on line of credit   (1,682,500) (1,525,100)
Payments on other debt   (2,556) (3,769)
Payments of contingent consideration related to acquisitions   (11,883) (8,547)
Dividends paid to shareholders   (8,710)  
Dividends distributed to noncontrolling interest   (3,557) (4,838)
Proceeds from exercise of stock options   459 314
Excess tax benefit from equity-based awards   420 1,086
Purchase of treasury stock   (16,602) (47,281)
Payments of debt issuance costs   (35)  
Net cash used in financing activities   (27,464) (48,035)
Effect of exchange rate changes on cash and cash equivalents   (20,002) (8,275)
(Decrease) increase in cash and cash equivalents   8,854 (70,405)
Cash and cash equivalents, beginning of period   77,316 158,017
Cash and cash equivalents, end of period 86,170 86,170 87,612
Supplemental disclosures      
Cash paid for interest   4,640 4,038
Cash paid for income taxes   10,924 10,540
Non-cash investing and financing activities      
Acquisition of equipment through increase in accounts payable   5,448 $ 2,944
Acquisition of long lived assets through capital leases 5,316 5,316  
Dividends declared but not paid $ 8,713 $ 8,713